Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a2533279ef53e7…

MALICIOUS

PDF

85.5 KB Created: 2021-05-20 13:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ac2f0d79f41927cb495ebf7c6ba35d56 SHA-1: b623d0555b04ef657bcd30e1b71f0a7dbf392976 SHA-256: 75a2533279ef53e7d7edc70161ddeddee238ff68d149b2ff114b8c36279623a3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many of which are likely part of a link farm designed to obscure the true malicious intent. The primary malicious URL identified is https://fokemale.ru/strik, which is likely used to serve a second-stage payload. No scripts were extracted, but the presence of numerous external links and the 'PDF_SEO_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=brocade+fabric+os+upgrade+guide+8.2.1 PDF link annotation
    • https://xadajosawot.weebly.com/uploads/1/3/1/6/131636584/maguwu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481069/normal_5fe3ae47d8ed7.pdfIn PDF document text
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/d6b9c0917894f8b.pdfIn PDF document text
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/gibumiwaxuzikur.pdfIn PDF document text
    • https://fafutetigav.weebly.com/uploads/1/3/0/7/130775448/9050318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448713/normal_600fd293b8d55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415292/normal_5ff4371fa6a06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424024/normal_5fe0df49e1cb3.pdfIn PDF document text
    • https://jizexukufi.weebly.com/uploads/1/3/4/1/134109318/4888035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_60592a0d21589.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/posufij/puffin_web_browser_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/2648972495.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/all_of_me_piano_sheet_music_advanced.pdfIn PDF document text
    • https://s3.amazonaws.com/xapijifas/vogilewebubudiju.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/sejufisimiradu.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/bulova_precisionist_watch_review.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/96042413364.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/ansible_template_variables_undefined.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/30436699279.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_off00010ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE5 5888 bytes
SHA-256: 7f26c6ce962181ec604f6ebf343675ec90dbab78859195ae6150c726ebdc9906
font_01_sfnt_off00012303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12303 11036 bytes
SHA-256: 404d6dc6df1af0594c5fcf5397024308112d584b1f387406fecee476a0493be4

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