Malicious PDF — malware analysis report

Static analysis result for SHA-256 121908f1d0937163…

MALICIOUS

PDF

77.5 KB Created: 2021-04-04 18:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a2c66b57aad46721b1346f6a19133eb0 SHA-1: ab66979b8cfe1c717fab9823628790f9b7756ce0 SHA-256: 121908f1d0937163561638b640917d12fef882dee6eeb439cecd24f808b40c2b
126 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. The primary URL, https://soxebez.ru/wix?keyword=vag+com+codes+seat+leon, appears to be a keyword-driven redirect, likely leading to malicious content or phishing pages. No scripts were extracted, but the PDF structure itself is designed to funnel users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://soxebez.ru/wix?keyword=vag+com+codes+seat+leon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456121/normal_5fe74218acee8.pdfIn PDF document text
    • https://cdn.sqhk.co/wavagowew/NDlMRih/how_to_iron_your_clothes_without_electricity.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5fedbd1c2dd72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_603618d48bf5f.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/hO8cigC/surf_shack_vpn_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/lajojeletab/jgfkgfL/marketing_jobs_salary_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410674/normal_6020a3a9c04c5.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxarulenogu/avLhjcy/tugutigeluxuregube.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/hc6jejd/3d_puzzle_model_cardboard.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415308/normal_5fea433f6c57c.pdfIn PDF document text
    • http://bijukexamova.scienceontheweb.net/arizona_a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414852/normal_602f608cdcf58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369760/normal_5fef5e5700448.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_4b26b63532b54f6f8572a722b42ad207.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21590e96-649e-4e82-b725-9885fa4b21f4/developing_management_skills_9th_edition_apa_citation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f7c5479-1c11-43db-a5c3-788541c738f9/kejevitizakotilaxon.pdfIn PDF document text
    • http://wenares.myartsonline.com/lovefa.pdfIn PDF document text
    • http://kebenubes.onlinewebshop.net/arithmetic_progression_class_10_ncert_solutions.pdfIn PDF document text
    • https://9c50f6df-e9c1-453e-a208-eff1cefe231f.filesusr.com/ugd/44b3dc_1f9ff1f9310e414292892fc811fa08d0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5D 5128 bytes
SHA-256: df28165276c2263cf772cdb670175ce96052f19ba6a41eee6107b7cf76083b5c
font_01_sfnt_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 11504 bytes
SHA-256: 11156def661f741c2566b904cc8d702a4548f24c18cd800279c79988ba52c6e0

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