Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b562b69111948b…

MALICIOUS

PDF

78.5 KB Created: 2021-05-28 23:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5249632b07d6266386a20514396453b5 SHA-1: eee418ed133adc6b92f6701c4ed6f063f03e3cf1 SHA-256: 86b562b69111948b3e5bf7d4c8cffb2e4e7511e23317f2611c58639a0b9537c8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO-based redirection. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to potentially harmful content.

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://botokaw.ru/strik?utm_term=who+is+jason%2527s+father+in+pretty+little+liars PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451377/normal_601b92606d61f.pdfIn PDF document text
    • https://xelasukozulete.weebly.com/uploads/1/3/2/6/132681542/9daa1.pdfIn PDF document text
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/rujejuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465389/normal_603d8029bac62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_60348be24e63e.pdfIn PDF document text
    • https://tuxativavowaz.weebly.com/uploads/1/3/1/4/131437956/lebenavurujuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476150/normal_60512845e44e3.pdfIn PDF document text
    • https://koxamuru.weebly.com/uploads/1/3/4/8/134890845/d2f22526b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366324/normal_5fc5d3fd89399.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415300/normal_5fed9e0d3a13f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371800/normal_5ffb96d45135c.pdfIn PDF document text
    • https://nopovufarake.weebly.com/uploads/1/3/1/3/131379277/besanuganopoj-kolamemo-jipex-zigazazosexadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444095/normal_60282e7930b8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_6056ab844eeca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478133/normal_6049a49021d21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412570/normal_5fd83eee7fcbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445558/normal_6037bcf44525e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405459/normal_5fc5e1bb45e17.pdfIn PDF document text
    • https://tubidexoz.weebly.com/uploads/1/3/5/9/135994678/wijuvufajotasuw_robugodunozede_jusisazevib_buvitefuxev.pdfIn PDF document text
    • https://rukawaxosudeda.weebly.com/uploads/1/3/4/3/134308265/zubisetuzive_fujorexulezo_maparedonewag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 5216 bytes
SHA-256: 9e5939190070ebfabbaa69c408fbf94845f1cf35269cdaa4c2359a6c02cc02ac
font_01_sfnt_off00010370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10370 11660 bytes
SHA-256: 068dbbf6d13b5b8f899f2620b13ed7554ccb1a7147f5b1a5c6119c3c68deba11

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