Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0601ec2718ebf61…

MALICIOUS

PDF

114.7 KB Created: 2021-04-07 00:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95540920b65e84aa751fd6261906ff1f SHA-1: 1133b99d80fd14333dcf461dd2a7c57c82ffb31f SHA-256: a0601ec2718ebf614263c4dc2caabb990522c4667a23cb3384c86f37429b72ee
186 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many of which point to disposable domains, indicating a link farm designed to redirect users to potentially malicious or scam websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or content redirection. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

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://seumenha.ru/strik?utm_term=what+is+meant+by+data+pointer+in+microcontroller
    • http://gejokakop.mygamesonline.org/5114746704.pdf
    • http://dapajurop.mygamesonline.org/60412167404.pdf
    • https://pidufemimin.weebly.com/uploads/1/3/6/0/136054052/napukepin-velokivolizipem.pdf
    • https://zixokamewi.weebly.com/uploads/1/3/4/3/134386319/4a0e379.pdf
    • http://sazulido.medianewsonline.com/25210422030.pdf
    • https://xuberirerumona.weebly.com/uploads/1/3/4/5/134586272/duvugomowa_gojusixebipiri_segabu.pdf
    • https://dikekivex.weebly.com/uploads/1/3/0/7/130775400/462042.pdf
    • https://pefibiwurabamiz.weebly.com/uploads/1/3/0/8/130874510/4766878.pdf
    • https://cdn.sqhk.co/dixejetafap/hg9hejh/this_war_of_mine_tips.pdf
    • https://cdn.sqhk.co/powosinubuk/YBiiGX4/35172931906.pdf
    • https://nenemonovov.weebly.com/uploads/1/3/4/6/134664350/wanugovegelosazufa.pdf
    • http://telovajov.medianewsonline.com/51863175102.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://3175e58c-9db9-4d87-bcb9-15e03531d93d.filesusr.com/ugd/c93210_6cb938bf638141e38ceb64710ab339b3.pdf?index=true
    • https://s3.amazonaws.com/zibenoroduzuw/how_do_i_contact_facebook_support_for_help.pdf
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_8843d3a402ab4f62a8592d80a34b9762.pdf?index=true
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_3ed1bc2e699d46569328b195ed1e4c52.pdf?index=true
    • https://s3.amazonaws.com/simujix/42597395017.pdf
    • https://413f70bc-0247-4a04-a3fc-eabb14e2b93f.filesusr.com/ugd/f18ee6_86f27a1b3b2c421da11ab01947ad6bdd.pdf?index=true
    • http://wareguw.atwebpages.com/fudobip.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_off00018048.bin
8b31c86ef32596ae2798a337c1ca1c2bcf4248f78c5b1272cf28b9925f609bb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18048 5568 bytes
font_01_sfnt_off00019317.bin
ecefbe7a681a8a2befdb8788d099ff4786ad0f580a898289d325ab593052b2c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19317 12456 bytes

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