Malicious PDF — malware analysis report

Static analysis result for SHA-256 b231916c91e13022…

MALICIOUS

PDF

78.5 KB Created: 2021-02-25 03:13:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2234ae6117c62407066a1abd91d69e8f SHA-1: 8590b52d3e506d4be2872dd344f9bc584d5789a6 SHA-256: b231916c91e1302205ae505f86e943a59ced78a8311309e480f332d22388abdd
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of external URIs and the overall structure point towards an attempt to lure users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=what+time+is+the+big+star+tonight PDF link annotation
    • http://sevezor.scienceontheweb.net/how_does_yeast_infection_affect_a_woman.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410447/normal_602f1eb048f6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461201/normal_601fd9f414dfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_5fe9a85778275.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390071/normal_600cbb625e7e1.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/7314153.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/8338604.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/dirt_devil_featherlite_canister_vacuum_reviews.pdfIn PDF document text
    • https://wudowured.weebly.com/uploads/1/3/0/8/130873715/2151013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481510/normal_60297ecd3cb3b.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/how_gm_diet_plan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kakasis.onlinewebshop.net/fegase.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/velidonodadevano.pdfIn PDF document text
    • http://mevexunimapo.epizy.com/sb-800_sb-700.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB2 3392 bytes
SHA-256: 298c944b23e33a732220394821d0b11043d54045094252558970ad653a8a1ed4
font_01_sfnt_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 5220 bytes
SHA-256: bd68710e2fe7a59e978dc2ec393e79c2660315e977fedb195520c7ef484cf802
font_02_sfnt_off00010975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10975 10252 bytes
SHA-256: 4fa1505aa6621ef58b075a059c74d8c8b3d6fd8c787784e147974efdb167686c

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