Malicious PDF — malware analysis report

Static analysis result for SHA-256 0772bce9921bebd6…

MALICIOUS

PDF

81.2 KB Created: 2021-03-24 12:59:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 241f867676648aa20d44c9371bb57418 SHA-1: bf0ff93d7b8e346d1ed8790eca4cf54386fd5af3 SHA-256: 0772bce9921bebd6773db87b3473e5c393db380c4e431d2662a5ffe18d2d1085
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 SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/123?utm_term=free+credit+report+once+a+year+government PDF link annotation
    • http://jugepawe.medianewsonline.com/jesus_bleibet_meine_freude_piano_sheet_music.pdfIn PDF document text
    • http://tipopajokoti.iblogger.org/non_disclosure_agreement_uk_template_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427273/normal_6035d4e75a1a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490129/normal_6028b57602f83.pdfIn PDF document text
    • http://ladekepevij.mygamesonline.org/88747766758.pdfIn PDF document text
    • http://tajizomekoza.iblogger.org/25846337168.pdfIn PDF document text
    • http://girepodemaz.getenjoyment.net/semilavakiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463810/normal_604c99bd22aa3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jiwisi/acrobat_writer_online.pdfIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_0231889f9e7848e5a08a79b9524b49e9.pdf?index=trueIn PDF document text
    • http://pitaken.onlinewebshop.net/benefits_of_fasting_in_ramadan.pdfIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_64402fe30b2746b88b2eb88b764f4c5a.pdf?index=trueIn PDF document text
    • http://runapapaxezupow.rf.gd/avast_cleanup_tool.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_3b3ba73b67ba4711a9513def0eeaf9ab.pdf?index=trueIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_cd71e83e9dae41209a95b1981f4fd696.pdf?index=trueIn PDF document text
    • https://8137cd1e-393d-4948-8193-eca935452849.filesusr.com/ugd/756799_0950dd06536f48eb98eaa6300e334c81.pdf?index=trueIn PDF document text
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_ea3c48a2012143768c8ef89b747c0cad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nagudo/7524055246.pdfIn PDF document text
    • http://nesuvumuvugelo.epizy.com/46685263959.pdfIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_073da4ae2ff345aa8bf524765c447c38.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 5300 bytes
SHA-256: 9ca4e6b643a8e715f4aab4a4b75a3fecaade229ab056bb890ee977cd7a1e3106
font_01_sfnt_off00011271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 10916 bytes
SHA-256: cd883797c32fa698515de351ac2f668ff6be3940ea9ac946a2c843b2fefef4aa

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