Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c0c6cc9223b880…

MALICIOUS

PDF

78.2 KB Created: 2021-05-30 09:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ca0b7b509aa5aece85f8572724b23719 SHA-1: 59c916cbc6e7960c1b8e90d138a488fc89bd525b SHA-256: b4c0c6cc9223b880482093f146fe053a330f4e78b4c720dbfa32dab3ce56f7d2
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, suggesting a link farm or phishing campaign. The document's structure and embedded links indicate it is designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=is+cma+hard+to+pass PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369768/normal_5fc9b6c3f22e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494160/normal_600c00eb2cdf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444646/normal_6011a631c6667.pdfIn PDF document text
    • https://xufidevudog.weebly.com/uploads/1/3/4/3/134389214/kidaj_rojegisuzitalo_rigeji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423453/normal_60220d4f7d652.pdfIn PDF document text
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/3460922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413119/normal_60647fa86467b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5ff56a5c30816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481273/normal_604d5d119153b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421461/normal_5fc91e0e23dce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382617/normal_5fe5d0e1973c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424632/normal_602813e873b5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404488/normal_5feb54a23edee.pdfIn PDF document text
    • https://wezefumuge.weebly.com/uploads/1/3/4/6/134614004/mititetilori-dadatomukiwereg-kifosigokotezet-vikedudafe.pdfIn PDF document text
    • https://dokarugosili.weebly.com/uploads/1/3/4/3/134362608/kitenafanarodo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468267/normal_5ffde496525a1.pdfIn PDF document text
    • https://zugatesek.weebly.com/uploads/1/3/6/0/136082504/zaperifax_zagiradef_fogomomutiroxij_minexoti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_5fdc5ccd9248f.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/eb80a213-7efb-4d8c-9b35-019282d6f455/94785712400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb11bfa-b15a-4ecb-82df-85bfdbf159a4/14908459805.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 5220 bytes
SHA-256: fee888233577f8b6ddbdbc9712d7568c11adb3df26ae4268345418f848120b55
font_01_sfnt_off0001073c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073C 10784 bytes
SHA-256: 41416dd1c7e28311e8e82b5d60c00c506416775f1d4dfd42f501bb77a3228aec

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