Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bdf56a1759c3ee…

MALICIOUS

PDF

73.3 KB Created: 2021-02-05 19:50:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 8109be30bfede617d08a6f5679d8ce03 SHA-1: 63a248a3e727f82378be885ada0bef750e78b514 SHA-256: b1bdf56a1759c3ee102838117e57a4daea3f33e074551c5dcf864a009078ca85
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a malicious redirector and a link farm. It contains numerous embedded URLs pointing to external PDF files, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple malicious links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=blu+ray+storage+shelf In PDF document text
    • http://retys.fun/150507890194q445.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371514/normal_5fe3159b82b06.pdfIn PDF document text
    • http://fuckfrsky.com/acrylic_nails_with_rhinestones_designskeprz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446027/normal_600b66a33ee95.pdfIn PDF document text
    • http://it50discount.pro/a_level_physics_cambridge_notes7g7ie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489257/normal_5fea26d9c8159.pdfIn PDF document text
    • http://reduslimitalia-official.website/vododifoturac91du.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367277/normal_5ff2d655073e3.pdfIn PDF document text
    • https://vebafuxitupum.weebly.com/uploads/1/3/4/8/134890404/vapewisivonamoz-farujigug-kepimima-zabodokisune.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421478/normal_5fc841bee00aa.pdfIn PDF document text
    • https://mibirewisurux.weebly.com/uploads/1/3/5/3/135313447/kozanore_puliluxajerenes_kesogo_suvapida.pdfIn PDF document text
    • https://jolidezebixisu.weebly.com/uploads/1/3/3/9/133997790/b9ce7fcc6f262f8.pdfIn PDF document text
    • http://zalavsky.ru/61281778053hwnal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473919/normal_5ffb6b1da73db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425507/normal_5ffdd19cd6ea1.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/goat_simulator_craft_minigun7gt2n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386621/normal_5fdbde36216c1.pdfIn PDF document text
    • https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/mivinimuvavu.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_off0000e1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 5180 bytes
SHA-256: 5881b629eca6ca8b326f91f4e3318309558302ef232e750649033a9f8210d543
font_01_sfnt_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 11216 bytes
SHA-256: b26acc1ae91dc07be350eaaf9112f69a16926529ff505f56abb2e1751a64d3e7

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