Malicious PDF — malware analysis report

Static analysis result for SHA-256 9341b3e4e20ed14e…

MALICIOUS

PDF

67.8 KB Created: 2021-02-21 10:33:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 96af6b8c5d2cd0d3d3b0ee4665aa1c7f SHA-1: f758a7cfad018574586dacd9bdae256231cf175a SHA-256: 9341b3e4e20ed14e359c38c88e8cdb13c6dd09e7ecd3b4acdb738271f189c52c
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous external URIs, with one prominent example being a UTM-tagged URL that redirects to a PDF file. The presence of these links suggests the document's primary purpose is to redirect users to malicious external content, likely for phishing or further malware delivery.

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://leonvi.ru/strik?utm_term=how+to+program+magnavox+universal+remote+model+mc345 PDF link annotation
    • http://zuvinesewuwiz.iblogger.org/single_candle_hd_images.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384828/normal_601fee14b53b0.pdfIn PDF document text
    • http://poroda.site/exercise_stress_test_sample_report5b2wl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469365/normal_5ffc521173930.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/latest_version_of_instagram_for_androida2703.pdfIn PDF document text
    • http://elerctum.org/kepudowilotovedafenibufuxuvm.pdfIn PDF document text
    • http://burrrhey.tech/organizational_behavior_textbook_18th_editiongylcp.pdfIn PDF document text
    • http://pollsexpert.com/riptide_gp2_mod_game_download5jukc.pdfIn PDF document text
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/e80f705909.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451049/normal_6031d7032aa86.pdfIn PDF document text
    • https://duzesoduvumasu.weebly.com/uploads/1/3/4/1/134131570/texosedujemesaruded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379959/normal_5fdb3c54096f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://soxenaroguz.rf.gd/63749001410.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_off0000ca6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6E 5948 bytes
SHA-256: 8276c5e1d5457f71bd61b2962381907661ba20f27b45e3a0e433594e0db50ebd
font_01_sfnt_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 10368 bytes
SHA-256: 89bd73a2a5cccf358b3d138ddf295ad7d1d8aa4534748ad8e111224264b03dc2

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