Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1c7f826ab0d5a0…

MALICIOUS

PDF

80.8 KB Created: 2021-03-19 12:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4965ec36a96d7f8e554a418a3dab4666 SHA-1: 0e021fccf41d36c4e23783929d1b711c5c1ab036 SHA-256: be1c7f826ab0d5a0ec90bf42fb8ee5152f9abb02b47ff72f857ad62f23de6b3e
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including ML classification and a specific MFA lure. It embeds numerous links, with one pointing to 'https://midufefew.ru/strik?utm_term=how+to+cause+a+stock+market+crash', suggesting a phishing or credential harvesting attempt. The document body, though heavily obfuscated, is associated with the URL and the overall structure points to a malicious PDF designed to redirect users to potentially harmful sites.

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://midufefew.ru/strik?utm_term=how+to+cause+a+stock+market+crash PDF link annotation
    • http://drenajkrasnodar.ru/gt_1000_boss_pricemthv1.pdfIn PDF document text
    • http://originalhallyu.com/webportal._edicomgroup._com_facturacioneh4sm.pdfIn PDF document text
    • http://canonsburglake.org/xodozitalodojanajapjuygt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462697/normal_601f6864881d5.pdfIn PDF document text
    • http://tryplafond.xyz/73686397911kt0cn.pdfIn PDF document text
    • http://kevikakagax.iblogger.org/4449239460.pdfIn PDF document text
    • http://lalashoppen.online/how_to_program_vector_to_talklwolm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481064/normal_60345f4484092.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5febc2025ac11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387428/normal_5ff7a8a829d79.pdfIn PDF document text
    • http://timelessdecorum.com/9557010524970y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411937/normal_5ff625308d969.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427300/normal_600498675ab19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405179/normal_60264a1e589c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454575/normal_5fdef22524782.pdfIn PDF document text
    • http://okstore.info/27588773945gp0bx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459467/normal_6002a9506a033.pdfIn PDF document text
    • http://amandeepsadyora.com/novopibisodinqxjv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pepajefosub.epizy.com/vanonopokugedosumofasuged.pdfIn PDF document text
    • http://tirejazanapo.epizy.com/dobatose.pdfIn PDF document text
    • http://tegufomaliduki.epizy.com/wujetogurixikimifopedata.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_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 5124 bytes
SHA-256: f5a3fe356baef18a6507650f2f5107d46f04503d55c1816d1e2c156626ad5cc4
font_01_sfnt_off00010cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC4 11668 bytes
SHA-256: f3fa423207b65809d01dbb0d3009acb51c4179fcab08154a72c9ad5bee82a56c

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