Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c28dcb219b44c7…

MALICIOUS

PDF

67.8 KB Created: 2021-02-10 14:07:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 76b6b43a25354fe1060a4f5cf4ef2322 SHA-1: 4720e549d4700afd15b47587d786b317386b161a SHA-256: 34c28dcb219b44c7c1c96c2547e25e7799ee540d81f2564d4cc0bc73d18e082f
156 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 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files. One of these links, 'https://baarspo.ru/123?utm_term=how+long+is+a+policy+memo', is likely the primary lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. No scripts were extracted, but the structure suggests a phishing attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://baarspo.ru/123?utm_term=how+long+is+a+policy+memo PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452376/normal_6003f4f977752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495393/normal_600f65164e24f.pdfIn PDF document text
    • https://cdn.sqhk.co/pefatipi/iihtjem/world_adventure_dora_the_explorer_season_4.pdfIn PDF document text
    • http://studyweb.site/platformio-_ide-_terminal_for_atomjwnq2.pdfIn PDF document text
    • https://cdn.sqhk.co/xokunafuse/UrYhche/95001132376.pdfIn PDF document text
    • https://livupojinobiz.weebly.com/uploads/1/3/1/8/131856358/relagewoper-fokew.pdfIn PDF document text
    • http://vir-tus.com/the_browder_filessu5r7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_600e85d763069.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470017/normal_5fe2ec6e6591d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fexuror/vidmate_windows_software.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/vovipetapovuj.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/93300912101.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/image-_guided_and_adaptive_radiation_therapy.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3D 5312 bytes
SHA-256: 43a03288a12993f15db2db4fbd82a78360de11f26d9961e313d39afdfa51246b
font_01_sfnt_off0000df60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 10372 bytes
SHA-256: be1df0be0462547457c3711e9c8c06e9b14732dcb1b7db01d5470e3a0e833002

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