Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08c599b26b68846…

MALICIOUS

PDF

73.2 KB Created: 2021-05-23 15:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3fae593bdd8fb094e4834f68db2dfe7f SHA-1: b0de43fe9faa6fc5d1087899c263d21a62f6cb9b SHA-256: d08c599b26b68846e791750f4e2ce320851d7246ef7b72520556939fb3c3ac4e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://xezojetit.ru/strik?utm_term=le+singulier+et+le+pluriel+exercices+pdf PDF link annotation
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/ripufulunorejema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_606df87635340.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369915/normal_5ff50e5793dda.pdfIn PDF document text
    • https://dekamukovesu.weebly.com/uploads/1/3/5/3/135324216/8350040.pdfIn PDF document text
    • https://lolisusije.weebly.com/uploads/1/3/4/6/134627287/gidebov.pdfIn PDF document text
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/64121.pdfIn PDF document text
    • https://xamikike.weebly.com/uploads/1/3/1/4/131406211/wenumagisuvixe_rizadizuke_zanukelodagewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_60280f41c22fb.pdfIn PDF document text
    • https://nodemudikukurev.weebly.com/uploads/1/3/5/3/135348567/5241573.pdfIn PDF document text
    • https://maludanojuwido.weebly.com/uploads/1/3/4/5/134591959/vezifu-lirorunek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413120/normal_5fd3c037afda5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455396/normal_5fc7e2d0775b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447253/normal_5ff93a952c907.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_6048870610221.pdfIn PDF document text
    • https://fopilifufisi.weebly.com/uploads/1/3/6/0/136055159/jirutimo-minotobapazixuj-wokode-mumilutavurolil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403404/normal_603f477a71ccd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451544/normal_605c0a8b15269.pdfIn PDF document text
    • https://widajuzuno.weebly.com/uploads/1/3/1/6/131637349/vivowoguniz.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_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 5120 bytes
SHA-256: 494fa9df480ba7b4978fc6896d8c72bac1115207d60a21b0d67cb8a52780e809
font_01_sfnt_off0000ec2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2F 12952 bytes
SHA-256: ab3ea00194cb658eb3269fe32d627bba26ee9f1d6d4f7d0f1dfd8f8d9d2f8373

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