Malicious PDF — malware analysis report

Static analysis result for SHA-256 60584e85c15c75b7…

MALICIOUS

PDF

64.6 KB Created: 2020-11-25 19:45:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bec7859a8f4ecd0141ac058953fe8e9 SHA-1: 1cd475df132efcc5a476a4c88bb221aec49f1aaa SHA-256: 60584e85c15c75b7cbd5fcf632fefc38333a163080be6163d34116a5c58a2277
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffine.ru/strik?utm_term=head+and+neck+anatomy+anki
    • https://fopudodesesiwen.weebly.com/uploads/1/3/4/3/134344932/3855598.pdf
    • https://bivixogerixud.weebly.com/uploads/1/3/4/4/134469213/xevufi-lenopazako.pdf
    • https://gaturavokig.weebly.com/uploads/1/3/4/3/134317265/pamuxuwurisa.pdf
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/gadusujulu.pdf
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/watokifijesomozebef.pdf
    • https://lesofetu.weebly.com/uploads/1/3/1/3/131378838/c4fc5265.pdf
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/punobinabesujodazufi.pdf
    • https://kovumagamu.weebly.com/uploads/1/3/4/5/134578336/nixobusiwap.pdf
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/458a5d74bac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/felasorarabipis/litiguvemipepegopa.pdf
    • https://uploads.strikinglycdn.com/files/d7f23e7f-b323-46bc-8a7c-63d2b3c7ca99/47831098708.pdf
    • https://s3.amazonaws.com/zaxawetawupo/visual_studio_for_mac_prism_template_pack.pdf
    • https://uploads.strikinglycdn.com/files/4f7d23ca-b706-41e1-bceb-1c30c48f2e1d/movewa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c10d.bin
8e12f71bdd742d6c0019b632b5e14fb30bf7755a2d46dcf0587d0d5a8427e936		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC10D 4908 bytes
font_01_sfnt_off0000d1bb.bin
27bb4fb48ba8d45ff402df83bfc80929c1ff85a700caae6063cf96a21a1522dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 10720 bytes

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