Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c257b7a2756361a…

MALICIOUS

PDF

75.7 KB Created: 2021-05-11 11:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 38c45820c0b3503ba2a8246f1df93102 SHA-1: 73a76386d049c3b622bce139bfee9042b804951f SHA-256: 2c257b7a2756361a5959600a17f99bc7030868716e72e2cea10869dbe0f23b44
186 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, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=ariens+deluxe+28+sho+vs+husqvarna PDF link annotation
    • https://vapurexox.weebly.com/uploads/1/3/4/8/134865026/dexoz.pdfIn PDF document text
    • http://revenularozudo.66ghz.com/75860547171.pdfIn PDF document text
    • http://nesebonuvobeju.getenjoyment.net/85906220532.pdfIn PDF document text
    • http://ladijon.iblogger.org/lupemolokopoxixo.pdfIn PDF document text
    • https://borojixupoluba.weebly.com/uploads/1/3/5/3/135316148/1543045.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/duracell_1000_charger_flashing_green_light.pdfIn PDF document text
    • http://visetazide.medianewsonline.com/brche_multiplizieren_und_dividieren_aufgaben.pdfIn PDF document text
    • http://bamejudodenor.iblogger.org/tofezosupunezineg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiwozoma.epizy.com/41372851602.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_bebdb7b3a4a04b5c809717e3c12b8ead.pdf?index=trueIn PDF document text
    • https://f8bd9030-4518-40b4-9047-d478e6ffc17b.filesusr.com/ugd/608fe2_b57123fd47dc47ed804cff1a47521f87.pdf?index=trueIn PDF document text
    • http://riwexakax.epizy.com/administrativo_estado_temario.pdfIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_7eae5411a5ba430aa0de7237bb594c2b.pdf?index=trueIn PDF document text
    • http://puzegekizizovin.epizy.com/tupezuz.pdfIn PDF document text
    • https://69a7f268-727d-4112-ba4f-a3538cc856be.filesusr.com/ugd/9a0d60_b3946f3a8017400ab236bf4fbf9e8e65.pdf?index=trueIn PDF document text
    • http://tajarajizuwoso.rf.gd/microsoft_word_resume_template_add_new_section.pdfIn PDF document text
    • http://noniwelabezona.rf.gd/49232873031.pdfIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_e9cfc400977848268e0323a79651727e.pdf?index=trueIn PDF document text
    • http://dukizovisepo.rf.gd/89296073126.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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 5480 bytes
SHA-256: 2b5ef0e16fb504a2351b7ee210c032b13cdd1dc671a71efb617d7f2c6a06aeb2
font_01_sfnt_off0000fcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC8 10508 bytes
SHA-256: 249a62be206079af79810c121be828a10a30ca1f09cc6b4b11c94f393a46a014

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