Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8385804f5224b25…

MALICIOUS

PDF

75.0 KB Created: 2021-05-18 09:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8046abbd6cafa3e2b89383e1e5adce7a SHA-1: df4a6a26ce1d1cd4ec898b4278ee142e57286ac5 SHA-256: b8385804f5224b255456752c6c9dd24539b375a805a11667c88a17dbec4dbbf2
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a URL. The embedded URL, https://seumenha.ru/strik?utm_term=how+to+graph+a+solubility+curve, is identified as a redirector for free-download phishing. While no scripts were explicitly extracted, the PDF structure and the nature of the URL suggest an attempt to trick the user into downloading a malicious payload, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/strik?utm_term=how+to+graph+a+solubility+curve PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446280/normal_5fdebcc6657a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457586/normal_605a02abc2f57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417525/normal_5fecc0a442fe7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454547/normal_5fee9636c76fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481539/normal_60274a4ce7bb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_5fd0a149e1f6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_6046295856bee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_605a5b9f7710d.pdfIn PDF document text
    • http://zajowidased.iblogger.org/kesovemufin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489844/normal_5fe1669d16687.pdfIn PDF document text
    • http://kuvuradivikosef.iblogger.org/99008687171.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468572/normal_60565bc8324d3.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/76a5b04b-6ac5-44c2-b525-05f152eda1c0/brookstone_big_blue_studio_speaker_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd0069b-0e01-49df-a6bc-54aa4475f238/17007310421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31da2f1b-0151-479c-875d-9130e4262843/39449892266.pdfIn PDF document text
    • http://diverozisutujew.epizy.com/csf_analysis_normal_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39690211-3f77-4370-8fcd-89d9e20856e7/70863748782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d8cf1e6-c742-4b04-b186-4628b3ea17aa/pretty_little_liars_season_3_episode_19.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6901f24d-dfad-493c-b278-980124c5a0ab/78308395433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e05d5765-367e-446c-9d95-f7868e4b6773/wufikiwuzato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca7371d9-21da-49af-af84-71708bd47415/international_lawyer_salary_in_south_africa.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_off0000e62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 5552 bytes
SHA-256: d930d548006f2301bc6bb26f35cad6620e0f2b9da020ef677999acc831fdfe2a
font_01_sfnt_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 11176 bytes
SHA-256: 59004ba50469b969423e2e44fe0fc50ba258f83ebac61f2eb726d64f1741c5d9

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