Malicious PDF — malware analysis report

Static analysis result for SHA-256 b682d8174a87aa36…

MALICIOUS

PDF

80.7 KB Created: 2021-03-06 07:51:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6b6da778c979564e7c24f0aea2798a4b SHA-1: 0f7aaa0d6cee579e1d12d87fb68c80b6e305dc5e SHA-256: b682d8174a87aa3612768ccaa577d5dc0448b48be722020578316189a19b368e
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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=waiting+time+for+190+visa+invitation PDF link annotation
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/3464003.pdfIn PDF document text
    • https://satefavazavapof.weebly.com/uploads/1/3/4/7/134718375/942d7.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/52073418046.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/reguv.pdfIn PDF document text
    • http://tilosag.mypressonline.com/sobisupomezisumetoribenus.pdfIn PDF document text
    • https://bativizamazon.weebly.com/uploads/1/3/4/7/134770744/mijudazilo.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/buvakinu.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/what_is_a_primal_fear.pdfIn PDF document text
    • https://rekasefuwe.weebly.com/uploads/1/3/0/9/130969231/463bac9cb5.pdfIn PDF document text
    • http://lokubakodo.getenjoyment.net/xosakubedeteraxizuvad.pdfIn PDF document text
    • http://xipodijajul.sportsontheweb.net/zajavuno.pdfIn PDF document text
    • http://gexifivavipi.iblogger.org/vezalopomudaniwofirog.pdfIn PDF document text
    • https://ronunute.weebly.com/uploads/1/3/1/0/131070227/9544130.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/constitucion_poltica_estados_unidos_mexicanos_1857.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_3de9b8fbdf6645f4ada98fb3e5e62860.pdf?index=trueIn PDF document text
    • http://sijadogif.atwebpages.com/5000_year_leap_free.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_51dc774a30f24a02993a17b83c7e63dd.pdf?index=trueIn PDF document text
    • http://zoribele.epizy.com/zevefekelusakirigib.pdfIn PDF document text
    • http://soranodabiwegi.myartsonline.com/prince_lionheart_wipe_warmer_pop_instructions.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_a1ad16bc588d4573ba67068600a94965.pdf?index=trueIn PDF document text
    • http://fiforeru.atwebpages.com/how_to_do_a_budget_in_quicken.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_f16a712c718c4c7a862231a773647a11.pdf?index=trueIn PDF document text
    • http://xowobovu.myartsonline.com/macbook_user_guide_apple.pdfIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_4165c8850662476cabca13cd8d7aa905.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 5268 bytes
SHA-256: 76f98ca9d5a7d487f2586c1851a55027e7228444ea4abad67e690e67e76197f7
font_01_sfnt_off000101f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F1 10952 bytes
SHA-256: 947b9beee4ec5a7e7984d4e21e095205e219d013729e326c3e69b4c1474e5325
font_02_sfnt_off0001273e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3