Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0857666b0c823f…

MALICIOUS

PDF

74.7 KB Created: 2021-06-03 11:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 07926da57d88ac1004afa283e1678885 SHA-1: ddd799763e2636fc170fbfa732a715d2191a041e SHA-256: bc0857666b0c823f6f12559e127e620ad887ba4ab159917ff7a214e8971c65d1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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.
  • 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://chcial.ru/pbw?utm_term=depth+100+sodam PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412757/normal_6066946bd66d7.pdfIn PDF document text
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/6649670.pdfIn PDF document text
    • https://dugesadodi.weebly.com/uploads/1/3/1/1/131164249/tajulujesavedovufasa.pdfIn PDF document text
    • https://pusoguxararafog.weebly.com/uploads/1/3/4/5/134593470/kokevozomeje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411512/normal_5feb50a30ee0a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4470402/normal_60aff9dfa2df0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450047/normal_60491cdb26979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501659/normal_604db9326c0c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_6059663432025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489241/normal_602116dc647a2.pdfIn PDF document text
    • https://nudoguku.weebly.com/uploads/1/3/5/3/135306062/fuxonavev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385613/normal_5fee06e71e69f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365582/normal_5fcc69e35b6cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b91644d6-f3e5-45ee-ab5b-19e060681cdc/modern_recording_techniques_8th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/177ffa7d-ba5d-4d0e-909e-36c098741d31/juzepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0478ca01-ff8a-453d-872c-0bc2b30204c2/pigonitowofubezunedazogom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f03ac868-7299-4006-b262-059b3f5674c7/sebaguvugubujeduwokip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9688537-1ab4-4f0a-89c9-3ad711815dae/can_i_use_my_mobile_phone_as_a_tv_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d7db867-e09d-40d5-97f4-7dd2bc504b62/42398011301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2c7fdb0-966c-4aa0-bb75-60d07368c581/indicativo_telefonico_00229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8594d75-e1fc-479e-8ee4-cf594f7b910d/95963331659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc17a761-e2a3-4d63-a53d-0ddb2896402a/90156183255.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD082 5264 bytes
SHA-256: a9c4904fd319a82a682747c35997d228642d309d2f7bde7ad47d6fc761492472
font_01_sfnt_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 11296 bytes
SHA-256: 68ebe00c0d1ece26b0e6cdc662319a951be623ad359195b4fcfc37ceccf04a91
font_02_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 16068 bytes
SHA-256: 2e6efdb6ec6b06881b73571a6dc11127da1b4fc0f11d045bd7c2e12cbfc92ea6