Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb60ebdc3159a01…

MALICIOUS

PDF

67.4 KB Created: 2020-12-26 05:06:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2bc7e17f0857085ccbcb1dbd832374d SHA-1: 173a57f1b84a8bfade473df4041d6e33ad654d80 SHA-256: 3bb60ebdc3159a017448f3e83e91f9c03de44e02ac4c9d23236f206edde61d1a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for malware distribution or credential harvesting.

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://traffnew.ru/strik?utm_term=hunter+master+of+arrows+iphone
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/539567955d.pdf
    • https://mawajajapok.weebly.com/uploads/1/3/4/3/134353668/c847250543bdbb.pdf
    • https://static.s123-cdn-static.com/uploads/4376875/normal_5fcbe82b7900e.pdf
    • https://cdn-cms.f-static.net/uploads/4445892/normal_5fb6a9c29f08a.pdf
    • https://rowegodidevonu.weebly.com/uploads/1/3/4/4/134468430/57bd60dbeecf.pdf
    • https://cdn-cms.f-static.net/uploads/4495691/normal_5fae512ea7b9d.pdf
    • https://senovetesu.weebly.com/uploads/1/3/4/7/134710525/ranabeg_gunif_fagin_dotuwika.pdf
    • https://xonokuraku.weebly.com/uploads/1/3/3/9/133988937/6643972.pdf
    • https://nilorajokurede.weebly.com/uploads/1/3/4/6/134626806/3320191.pdf
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/37251b7.pdf
    • https://cdn-cms.f-static.net/uploads/4373519/normal_5f8e58a2468d8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xetasif/abasto_magazine_address_in_california.pdf
    • https://s3.amazonaws.com/nunakixuma/uc_browser_java_mobile.pdf
    • https://s3.amazonaws.com/memobofilenabon/mimumujane.pdf
    • https://uploads.strikinglycdn.com/files/8ce572db-91dc-4b34-8f4e-594b7f131e80/endless_space_2_cheat_engine.pdf
    • https://uploads.strikinglycdn.com/files/c8ac870f-28f7-43f5-b21f-73bf2349cfb1/the_conceptual_framework_for_financial_reporting.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_off0000cc86.bin
b550bee642c9c4f4a7485a7d243e71acb6ac70eb841b1e50c300c57115d3cdc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC86 5164 bytes
font_01_sfnt_off0000ddf7.bin
67035b8210abc147d921bfe001e58a40f547e611b126a2b814f8b97460ccb7a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 10324 bytes

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