Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6420acc77e39309…

MALICIOUS

PDF

113.0 KB Created: 2021-02-28 21:52:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 158bfd10ec2d920acf8ca14d256e6c76 SHA-1: e2d2d3ee3061b9d7ee93afa3778ad743000b485a SHA-256: d6420acc77e39309a2b3f4dabf6a20c7837c8e13727058c227fa9f19d0c5e7a6
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/strik?utm_term=plantronics+backbeat+fit+3100+reset PDF link annotation
    • http://ekzo-fruit.ru/96250855653rgel6.pdfIn PDF document text
    • http://pedron.fun/norma_iatf_16949_espaol1ga4v.pdfIn PDF document text
    • https://sagiwotagemo.weebly.com/uploads/1/3/1/8/131871993/betukifuna_mupuwefen.pdfIn PDF document text
    • http://filanion.online/john_deere_48_inch_deck_bearing8aweq.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/higjigg/random_64_bit_integers.pdfIn PDF document text
    • http://gemubanabugawa.mypressonline.com/muboleturisezin.pdfIn PDF document text
    • https://lonexababite.weebly.com/uploads/1/3/1/1/131163854/4329788874d9.pdfIn PDF document text
    • https://cdn.sqhk.co/nesuxozajek/gewrMSu/matlab_adding_zero_to_vector.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/XHjggjB/ice_age_hunter_gatherers.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/RgdGvig/tozupinetu.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/vitopojesazamudifimutaxu6dgem.pdfIn PDF document text
    • https://vojanaxopij.weebly.com/uploads/1/3/1/4/131453451/zimewu_xafagefi_wosaw.pdfIn PDF document text
    • https://severuzilun.weebly.com/uploads/1/3/4/7/134710190/sigegonexuz.pdfIn PDF document text
    • https://cdn.sqhk.co/toxodimina/XgcQ6ia/rasomefagozejewabesut.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/7399552202.pdfIn PDF document text
    • https://cdn.sqhk.co/labojime/eOFgcib/arijit_singh_songs_download_mp3_bestwap_2020.pdfIn PDF document text
    • http://toxedajenoxin.66ghz.com/christmas_bake_sale_poster_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.thdl.org/http://www.thdl.org/TibetanIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zowofiz.myartsonline.com/16733604846.pdfIn PDF document text
    • http://zidetunoz.rf.gd/61500901588.pdfIn PDF document text
    • http://zaxukesaludu.epizy.com/xowel.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlTibetanIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001133f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133F 6572 bytes
SHA-256: f8e893f13397ed75554267b457e1c702cb9f6c9e901bcb4de68b77b25b49230c
font_01_sfnt_off00012360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12360 3740 bytes
SHA-256: 7927e1e5e6b6b8656cf8bfcb25522463a6b4aa3d8242f2eb8978b2fdcd74f549
font_02_sfnt_off00013093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13093 5224 bytes
SHA-256: d52821932c802a851dd7ed832f07635a63ff5f56582a18ccb2e2d44deec9554c
font_03_sfnt_off00014261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14261 8520 bytes
SHA-256: 226f96e140d97b9ed77c72989056df3b54cb8e74a98bc55118f0f1d41529786f
font_04_sfnt_off000152c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C4 12692 bytes
SHA-256: 2c0bea5cbc445846db4e88da660edb6c89338370fada4861667ad85116a89d88
font_05_sfnt_off00017e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E11 16480 bytes
SHA-256: bda6d4194f2751c9a496de573087a50e2b9756fed74aa69ffa66d94dfb78d0d3
font_06_sfnt_off00019489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19489 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
font_07_sfnt_off0001a24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A24B 6084 bytes
SHA-256: b32373767ce9227b6261543aae12f58e20f3806c02454500b3db569d60683a09

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