Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec7c67d26fb0585…

MALICIOUS

PDF

72.5 KB Created: 2020-11-09 22:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2643aca1c0d0d8fe5e90a559c11c3475 SHA-1: e7c6db28e9a16a7e483fd71c0422c4e645a6f03c SHA-256: aec7c67d26fb058576cd17e1046cf73c5420ca56e57752c4af4f1196fd335f49
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to redirector domains and SEO link farms, indicating a phishing or scam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirector designed to lead users to potentially harmful content.

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
  • 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.
  • 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.
  • 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://traffine.ru/strik?keyword=etrian+odyssey+nexus+vampire+guild+card In PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/8993817.pdfIn PDF document text
    • https://xugirudubup.weebly.com/uploads/1/3/4/3/134332480/lagas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5f8bc4aabdd0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379220/normal_5f8a326bbdb29.pdfIn PDF document text
    • https://zekuwatifakaxi.weebly.com/uploads/1/3/2/8/132815855/9498234.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/buvabugugeni.pdfIn PDF document text
    • https://bigarafomamuwi.weebly.com/uploads/1/3/4/3/134318607/rugunimitirokala.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c854f12c-f53c-45f1-a6b6-19e9bd9ed756/26679012925.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/xetazorinujop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07b5fc92-d70f-4254-8f61-c93ea8054e13/zanovakoromemawif.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/campanilla_criminal_law_reviewer.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/2132378881.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/kobevekevuwevopezenefani.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD090 5460 bytes
SHA-256: 9cbab020dacac49d2f33f501590d231f16286003993cf3d257c69cfb00aeee56
font_01_sfnt_off0000e317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE317 10576 bytes
SHA-256: 2b45a548540f5be547741022343dc1cd010914cb8d731e40ae175f2e23d3ed76
font_02_sfnt_off0001071d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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