Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f279fc154371c0…

MALICIOUS

PDF

76.2 KB Created: 2020-12-28 19:45:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5127a591fed55de43bf4d9f5e791a175 SHA-1: 9d90a34d437eb9903055776f4705c853551e4b62 SHA-256: a5f279fc154371c05b758a27c246cd80fd48c504917fe8f61f50489c0bc52f6a
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external links, many pointing to PDF files, and uses a redirector URL that appears to be part of a link farm designed to lure users. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffset.ru/123?utm_term=teradata+interview+questions+cognizant PDF link annotation
    • https://cdn.sqhk.co/nepasibuta/tje14pk/konasunebefewudunowib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503533/normal_5fb42d779a6ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_5f927fe74d19d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393776/normal_5fe0eff07244d.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebosatu/KvjgByG/lynx_cat_breeder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367687/normal_5f8f95fc406f8.pdfIn PDF document text
    • https://cdn.sqhk.co/retirijozi/IJiceji/milusiladolejikexetes.pdfIn PDF document text
    • https://razebefalokugex.weebly.com/uploads/1/3/4/8/134895215/tuvuwovulitu_vopuxol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487658/normal_5fb49216a621e.pdfIn PDF document text
    • https://cdn.sqhk.co/duziketopefi/lbggLjd/33643134913.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/fjjgehb/glitch_camera_download_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444630/normal_5fd8a19796c94.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/tofizo/identify_active_and_passive_voice_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68f94509-bbb8-4e17-9041-35689d923c49/gejalarasode.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 5352 bytes
SHA-256: 92589d29e3176f82a0ad2ec5edd4d9a73927784a9216ab336801012872ed599e
font_01_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 11084 bytes
SHA-256: 21d74d4f6a13c927b7c539ac3e22cb21eecc69c69c6466272fe59044abf52089

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