Malicious PDF — malware analysis report

Static analysis result for SHA-256 462c7c203e9e9682…

MALICIOUS

PDF

89.9 KB Created: 2021-05-13 21:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 905a4682f542b91f0b101ca383e12fe3 SHA-1: 80ab611cfb48e893d682fb7686182c28742fe703 SHA-256: 462c7c203e9e9682510cd7fd6d902c474aec5dbc0418d07f0f2c4e6a487580af
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicative of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing or trojan delivery mechanism. The presence of external URIs and the overall structure align with techniques used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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.
  • 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://xezojetit.ru/strik?utm_term=best+glute+workout+with+resistance+bands PDF link annotation
    • http://gidilakapajuke.mywebcommunity.org/88064868364.pdfIn PDF document text
    • http://vilelares.iblogger.org/puriv.pdfIn PDF document text
    • http://euroshopme.site/dimimotanosuvabisegevunav8u.pdfIn PDF document text
    • https://cdn.sqhk.co/wafasojudo/ZIEGhh1/agnes_monica_teruskanlah.pdfIn PDF document text
    • https://xubebedi.weebly.com/uploads/1/3/0/7/130776367/25587b2.pdfIn PDF document text
    • http://sosaroxadexukex.iblogger.org/tosabukezumofafavavekaf.pdfIn PDF document text
    • https://cdn.sqhk.co/medujebukoma/iihjhhC/89096358657.pdfIn PDF document text
    • http://zimejitudik.iblogger.org/vijilakawasixus.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/venekal.pdfIn PDF document text
    • http://freedate18.xyz/canada_s_best_mattress_platform_bed8awje.pdfIn PDF document text
    • http://dasiwujupuna.sportsontheweb.net/.pdfIn PDF document text
    • https://diborukokaw.weebly.com/uploads/1/3/0/8/130814192/zokoput.pdfIn PDF document text
    • https://kelezisexuva.weebly.com/uploads/1/3/0/7/130739204/notatidog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://magufabag.rf.gd/retozagudikorowepexib.pdfIn PDF document text
    • http://tebaputazaxuva.myartsonline.com/bulk_up_program.pdfIn PDF document text
    • http://nunidekizezovaf.rf.gd/25516697886.pdfIn PDF document text
    • http://dinedolorexos.rf.gd/mirid.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013ecd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13ECD 18192 bytes
SHA-256: b786d36979173f24596fb73a95a929ac406fa74736f6ba5dd0968b1d95f85f31
font_00_sfnt_off00010602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 5544 bytes
SHA-256: 3618dcd261ef30da23fb3b93ad68346df3d3c272259259a788bfc494bcb506d0
font_01_sfnt_off000118e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E6 11040 bytes
SHA-256: 58cb1a6f2a733b544f2ba38dc46f24347bd8b274c2db8044cc3db5a52d20f3c6

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