Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d929e52248ad16…

MALICIOUS

PDF

80.9 KB Created: 2021-05-17 23:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22f131caf03c5acff06dec27f14f1d8a SHA-1: 72762679a73566368c8a11d442e90e5dc2e63d02 SHA-256: 96d929e52248ad162b4d08e8e78d8582a9518e995d37aa5032c4b44d8add15d7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or a mechanism for distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/strik?utm_term=how+much+does+stater+bros+pay+in+california+2021
    • https://static.s123-cdn-static.com/uploads/4496585/normal_6002bd7cac102.pdf
    • https://sikalejewop.weebly.com/uploads/1/3/5/3/135341852/5279bfc93b.pdf
    • https://cdn-cms.f-static.net/uploads/4489846/normal_60599e8ca393d.pdf
    • https://static.s123-cdn-static.com/uploads/4427267/normal_5fde9ffac0a35.pdf
    • https://static.s123-cdn-static.com/uploads/4402014/normal_6001d974b99bb.pdf
    • https://cdn-cms.f-static.net/uploads/4392195/normal_605fee40434b5.pdf
    • https://cdn-cms.f-static.net/uploads/4385413/normal_60171e5616de8.pdf
    • https://jupufafel.weebly.com/uploads/1/3/2/7/132740723/4aeb228641a.pdf
    • https://cdn-cms.f-static.net/uploads/4416131/normal_605b0e6928db4.pdf
    • https://cdn-cms.f-static.net/uploads/4446378/normal_5fe657ebd47d9.pdf
    • https://cdn-cms.f-static.net/uploads/4405687/normal_60605849aff90.pdf
    • https://valabonef.weebly.com/uploads/1/3/1/3/131379230/27f000dd2f.pdf
    • https://cdn-cms.f-static.net/uploads/4426556/normal_5fd225adcd182.pdf
    • https://cdn-cms.f-static.net/uploads/4420752/normal_601cbbeb75aeb.pdf
    • https://zuwuwuxi.weebly.com/uploads/1/3/4/8/134883554/5ff66f.pdf
    • https://static.s123-cdn-static.com/uploads/4477921/normal_5fef3a5f1bcf9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wujanozo/77125809360.pdf
    • https://s3.amazonaws.com/gagagakigibapo/answer_machine_detection_asterisk.pdf
    • https://s3.amazonaws.com/wulagisi/android_9._0_sdk_version.pdf
    • https://s3.amazonaws.com/xapijifas/belimed_wd_425_manual.pdf
    • https://s3.amazonaws.com/jadudusujuje/play_store_video_song.pdf
    • https://s3.amazonaws.com/vudivuzakal/how_old_are_jaycee_dugards_daughters_now.pdf
    • https://s3.amazonaws.com/sevoga/pipen.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_off0000f954.bin
1f4267aeeab1dd9ed5d05b02252967f87859a1ae3c8107509f642296a2681dbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 6016 bytes
font_01_sfnt_off00010dba.bin
d4cc82470ba7e5c8a5cbe79390df6486061328e6c7623bb1c8abadfa7cb8364f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBA 11260 bytes

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