Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a8954dd603779d…

MALICIOUS

PDF

75.2 KB Created: 2021-05-09 13:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a77520285b668d130e5e1664a6afa0f4 SHA-1: ff031089a0f09a7451ccd85f14c55e3cea5290ef SHA-256: 85a8954dd603779d34d3f0713bb682e6206d56391934121a657066b7da66f2a1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=turn+obstacles+into+opportunities PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483604/normal_606025cc57ce6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_601baca3bdc08.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/planilla_apertura_de_cuenta_banco_de_venezuela.pdfIn PDF document text
    • https://neredijavapud.weebly.com/uploads/1/3/1/4/131409024/2287925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_601ff3265961e.pdfIn PDF document text
    • https://vebaxifi.weebly.com/uploads/1/3/4/3/134360040/3345002.pdfIn PDF document text
    • https://fexasesari.weebly.com/uploads/1/3/1/0/131070539/554780a.pdfIn PDF document text
    • https://fupobemoxu.weebly.com/uploads/1/3/4/6/134669325/9437847.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377381/normal_5ff2e252ba42e.pdfIn PDF document text
    • https://kazawiluk.weebly.com/uploads/1/3/5/3/135384823/fazipumiz.pdfIn PDF document text
    • http://logunesunoj.medianewsonline.com/99184352174.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sarudinok.epizy.com/80164793242.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/22107496830.pdfIn PDF document text
    • https://s3.amazonaws.com/dazawojob/21357900245.pdfIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_0e0e6aa1264d4f21b9c8ec91314e479e.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_631320f9ff2d4a6ebab86d3f04d308c9.pdf?index=trueIn PDF document text
    • http://wabiraxo.rf.gd/what_is_the_importance_of_literature_review_in_writing_a_research_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/31075100170.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_7f7fcb47490c41e8abe445f6bd23727c.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

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_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 5016 bytes
SHA-256: 523ac75761c74322bc5cbb46e0d05204f4fa218ada66def0b84af9b8dcd04e9c
font_01_sfnt_off0000fa7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 10448 bytes
SHA-256: 63003c5d7c27a5a65709485df0f75b8cc01f4dd93779870378f82cb2eccadd4b

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