Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4d6ac8ce13c3bc…

MALICIOUS

PDF

78.8 KB Created: 2021-01-01 09:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 726709bc46c947638001282108a79432 SHA-1: e1fdbf91158f07601247b3bfad061635cecdc4a4 SHA-256: 7a4d6ac8ce13c3bc4cf67fd64f71153823bb1413af54dba67eaf0b760fa4c2a2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, identified as a link farm for SEO purposes, with one primary malicious URL being https://trafffe.ru/strik. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous links suggests an attempt to distribute malicious content or redirect users to phishing sites, aligning with spearphishing attachment tactics.

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://trafffe.ru/strik?utm_term=rose+gold+boot+covers PDF link annotation
    • https://cdn.sqhk.co/zetanitanedo/hciajaG/red_faced_warbler_range.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5f8fa54616ab5.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/gowixop.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/V9jbhgO/99258708786.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/jivuxo/37819274973.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/rozuterijagosed.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/allerton_high_school_sixth_form_open_day.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/learn_autocad_2007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28bb48b1-e627-418a-9ce8-0bfc9ab83d0f/anima_beyond_fantasy_character_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/kiror.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/compliance_audit_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b24f7c2-7dcf-4624-aa56-e93c383b42ae/solucion_cubo_rubik_20_movimientos_p.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/widogapavoxegululowenunet.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 6588 bytes
SHA-256: 746cda19d0a45b0d6108c63ff8192b2f88c2fff5e5937e692a7cb04b31166607
font_01_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 5104 bytes
SHA-256: 43d2ee0f7fb53e4874c0778dd9ab17c8c85f0b4d1d7bb10bbe507452aae7c95e
font_02_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 10968 bytes
SHA-256: 770c045bea929af5bb335cda5d676da2eeb4c850bd861b2ad8bae6cebc22a201

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