Malicious PDF — malware analysis report

Static analysis result for SHA-256 b684df9bdb89867f…

MALICIOUS

PDF

77.8 KB Created: 2021-04-01 00:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc29df4ef606367eecaa6a4e43efaec6 SHA-1: d802b5c871ed497cfa74cf33868c2b55d9a8cca8 SHA-256: b684df9bdb89867f376b49eec7e5e6be5f4a2301003b36b838009d9a0bc6b479
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of directing users to potentially malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/aws?utm_term=nutrition+facts+sonic+breakfast+burrito
    • https://guwulazavuwaba.weebly.com/uploads/1/3/2/3/132302871/8880223.pdf
    • https://cdn-cms.f-static.net/uploads/4403685/normal_602b8787c1787.pdf
    • https://tusuwijajibu.weebly.com/uploads/1/3/4/5/134517525/tediwir_terodow_wunutudanak.pdf
    • https://rowiteruna.weebly.com/uploads/1/3/4/4/134470704/5262596.pdf
    • https://dugegedop.weebly.com/uploads/1/3/4/3/134338267/bdde9c7a.pdf
    • https://cdn-cms.f-static.net/uploads/4383322/normal_6030a4b7231e7.pdf
    • https://cdn-cms.f-static.net/uploads/4368492/normal_60446b950154a.pdf
    • https://befewegumezozem.weebly.com/uploads/1/3/1/4/131453636/61ba73f773756.pdf
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/didalil.pdf
    • https://cdn-cms.f-static.net/uploads/4502493/normal_6064e7974c303.pdf
    • https://cdn-cms.f-static.net/uploads/4458621/normal_602931f7cd2f4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_16304d0cae744ef2aa24f7afa477289d.pdf?index=true
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_94bd27b4cdf54fe4accaa1a0e0814934.pdf?index=true
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_982875431a674000959c71dcdec95c35.pdf?index=true
    • https://uploads.strikinglycdn.com/files/992f42af-90ed-4617-ab57-8a1e013efca7/kosinume.pdf
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_27807986ebbf419d8716278e31222088.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a7b44a18-e54b-4bf1-8823-3dca41bbcf7a/blockchain_tutorial_free.pdf
    • https://uploads.strikinglycdn.com/files/e37b9dd2-e98d-4770-a4ae-0906efbd2895/15726906839.pdf
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_1633df08d3574f9093c7b7a8b93621f4.pdf?index=true
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_0c500703322245d8a669baae9a930946.pdf?index=true
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_a3edd23826fc48f4941371bcb74857b3.pdf?index=true
    • 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_off0000f31f.bin
4b23494feb27ac2ed02f6ee5cb194e544e990d0279b44881cdcdd6ada72c28fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 5016 bytes
font_01_sfnt_off00010447.bin
c56ee46bf95c6a9f30542f729c1a97c83bc5cde467b3f1e2165c1ccb76b62de4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 11000 bytes

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