Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3b414b48b33190…

MALICIOUS

PDF

69.3 KB Created: 2021-03-24 00:21:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85d0ee47481347d07886e75a45e4de5c SHA-1: 7d37f883b70825c2a0b9a5257d656c4e9eadf86d SHA-256: 5d3b414b48b3319018eb8de458613b60f50dd73b80fba6dcae46ef0021ae9101
156 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by heuristics for containing a link farm and being a phishing/malicious PDF. The document body, though partially corrupted, suggests a lure related to an 'Oreck air cleaner manual'. The presence of multiple external links, including one to 'dafemum.ru', indicates an attempt to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://dafemum.ru/wix?keyword=oreck+air+cleaner+manual
    • https://static.s123-cdn-static.com/uploads/4420752/normal_5fee3be7465ab.pdf
    • https://pakotoroxup.weebly.com/uploads/1/3/0/8/130815058/052d06a027ee312.pdf
    • https://cdn-cms.f-static.net/uploads/4410199/normal_60465118bfe3e.pdf
    • https://cdn-cms.f-static.net/uploads/4406208/normal_60329dd55dad5.pdf
    • https://cdn.sqhk.co/demanajinu/Uyjeqnn/bowonifowamub.pdf
    • https://cdn.sqhk.co/vipikunowi/qKhbign/texas_campgrounds_club.pdf
    • https://static.s123-cdn-static.com/uploads/4456996/normal_5ff61e2e9418f.pdf
    • https://nulosogitizibe.weebly.com/uploads/1/3/4/3/134317173/bdaebb9.pdf
    • https://static.s123-cdn-static.com/uploads/4369512/normal_5ff62bbfeb283.pdf
    • https://cdn-cms.f-static.net/uploads/4427287/normal_6009e49b2c52f.pdf
    • https://cdn.sqhk.co/xonipavu/jN1icif/9589220786.pdf
    • https://static.s123-cdn-static.com/uploads/4482618/normal_5feb325125dfa.pdf
    • https://static.s123-cdn-static.com/uploads/4447460/normal_5fe3921cd0ad1.pdf
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/faluk_kofik_zefiduwusepe.pdf
    • https://static.s123-cdn-static.com/uploads/4489054/normal_5fcccb7a10ccc.pdf
    • https://cdn-cms.f-static.net/uploads/4417662/normal_600aa5aa3a288.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_9da759d6d0404fac9adf9d7dc470f62a.pdf?index=true
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_e075e32901a1416d8efbddd14b6b3c83.pdf?index=true
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_d082df8492004ecd937b3ea519217d79.pdf?index=true
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_3622afd8af2b49f188d3e3cdd1ffd8b3.pdf?index=true
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_506e84666415469089109710256a01f4.pdf?index=true
    • https://27a83426-c768-4525-a63d-b5b732cca755.filesusr.com/ugd/28b3f7_4d4886a634024f1db39872c3702e944b.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_off0000d08f.bin
4c51f8dfbd5f17034c9f64dbc6243222f87e11a098b48aca41b9cb44ec8f4847		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD08F 4860 bytes
font_01_sfnt_off0000e103.bin
4ce92186a264ee89e1a3a0bc6ba3cf23e306e7989a425036f5192debcd6a2ed4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE103 10904 bytes

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