Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ee67626a863aed…

MALICIOUS

PDF

72.5 KB Created: 2021-03-09 10:02:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 93d61826797a8dddd5dcc7fa5940c314 SHA-1: 9f992ddfb0ddba0437faa58f503fd2d174cc1343 SHA-256: b1ee67626a863aedb9828a3cca3c5e6a4b4646f432e4d7423274f90c3b169d02
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains embedded URLs pointing to suspicious domains, suggesting a phishing or malware distribution attempt. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://nipisod.ru/award?keyword=jurnal+biogenesis+pdf PDF link annotation
    • http://sopugepibimel.mypressonline.com/what_is_critical_evaluation_of_an_article.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450501/normal_5fff5535a914d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425217/normal_5ff58eb04be4a.pdfIn PDF document text
    • http://puzexijabin.mypressonline.com/dipafiwotuvuduw.pdfIn PDF document text
    • http://xugaguf.mypressonline.com/42145957046.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/74139503373.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_ed341f1a7a754b3f9c2c33fea2a57062.pdf?index=trueIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_87c6a730bc244dd9802f55de0d197af2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e04ef0-1c93-4551-879d-3a8d7c540bcb/50934065392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac2a6ee6-f4eb-4ff7-b61d-1d3369e6fac0/durezevoti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b44b3be-4196-4436-9cc3-66cfc4b18fc1/zilarunemepomivugeguduva.pdfIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_49373e5f1c5446d5812ea99b4606dd19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a040a1ef-eaf1-452c-99d6-b6b3d2f421e4/why_is_my_samsung_dryer_making_a_screeching_noise.pdfIn PDF document text
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_d2648c8b22004e69bace84af04b9832b.pdf?index=trueIn PDF document text
    • http://womawujun.atwebpages.com/bowapezerepuzeso.pdfIn PDF document text
    • http://gegetebipa.atwebpages.com/nilugejo.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_off0000df6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 5336 bytes
SHA-256: f816534745605489f745efac98fc797f320554f9ef9d917f3c436511ab1ea723
font_01_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 10336 bytes
SHA-256: 1103204168d1b5809be89cc97143979edb5735818099857b773832e4a6f9de7c

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