Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a70447f4a086ac…

MALICIOUS

PDF

101.3 KB Created: 2021-03-04 12:33:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e50af8071cff1691b1d061876cafa4eb SHA-1: 4f58fec672ba1c23d521d1400fd225a59873a4dd SHA-256: 36a70447f4a086ac2bc4f5d6aa7246913b4e5b52390194405762a38059e61788
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one URL pointing to 'fokemale.ru'. This behavior, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a malicious intent to redirect users to potentially harmful content or phishing sites. The ML classifier also flagged this PDF with high confidence.

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://fokemale.ru/strik?utm_term=what+does+dsc+mean+engine PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422659/normal_603e2056370ef.pdfIn PDF document text
    • https://pilonalamajavex.weebly.com/uploads/1/3/1/1/131164122/pelame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472503/normal_603b3bcedec38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456372/normal_5fcd9b53b194c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_6032e025ab027.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484806/normal_5fe311c8849d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469850/normal_5fe6c119bf5ab.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/c367f189a.pdfIn PDF document text
    • http://detonicufficiale.website/ballade_n_1_chopinsjt9l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_601f6211d3291.pdfIn PDF document text
    • https://boxoxezerutevok.weebly.com/uploads/1/3/4/3/134317212/kexabo-burosanudomared-sijemod.pdfIn PDF document text
    • http://naturaleone.space/chunari_chunari_instrumental_ringtonesm74l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481834/normal_601f5924a4e93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419836/normal_6037598ea6883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_603db6dd34535.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414335/normal_6004f86987ab0.pdfIn PDF document text
    • http://urro-hu.com/garmin_delta_xc_remote_training_collars2vxc.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_off00014e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E65 5236 bytes
SHA-256: da9beea690651ff57fbd4d455c72717bb65ceb25a32a8477feb0b8cfd75a0e90
font_01_sfnt_off00016021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16021 12392 bytes
SHA-256: d0f4c4a8ab37046d54d807ef7034194b9bb807840bbb9653a02694dc369376b4

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