Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a83e44beec4f924…

MALICIOUS

PDF

75.4 KB Created: 2021-01-21 11:59:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a371442a876bf6fa39be63b511a77004 SHA-1: 9464ce8bf98ae5cb168467edd70b0bfccf61d3c8 SHA-256: 2a83e44beec4f92472b2706f9ad59412c2e6c86c261c3e125509f5800ab069df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, references 'Forum der schweizer geschichte', likely a pretext to disguise the malicious intent of directing users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://seumenha.ru/123?utm_term=forum+der+schweizer+geschichte PDF link annotation
    • https://tevoletefe.weebly.com/uploads/1/3/1/6/131606261/b626c6c1139d.pdfIn PDF document text
    • https://jadilibetaz.weebly.com/uploads/1/3/4/8/134871175/9482498.pdfIn PDF document text
    • https://jowavuzawevubab.weebly.com/uploads/1/3/2/3/132303017/rexibavin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451752/normal_5fa6d5d804b66.pdfIn PDF document text
    • https://nakojuxipesasam.weebly.com/uploads/1/3/0/7/130776326/xikupotupopenu.pdfIn PDF document text
    • https://wijejotuxaketuv.weebly.com/uploads/1/3/4/3/134338978/rudakepiwowugu-rugizow-mojap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473359/normal_5fcb3a834fcb3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litufowanukoro.epizy.com/allahabad_university_syllabus_for_bsc.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/android_messages_app_macos.pdfIn PDF document text
    • http://xofawuriduk.epizy.com/92388179880.pdfIn PDF document text
    • http://fepavipa.epizy.com/doxufuka.pdfIn PDF document text
    • http://dazigeles.rf.gd/fekexu.pdfIn PDF document text
    • http://sagalesokalu.epizy.com/21889725050.pdfIn PDF document text
    • http://nopizapokife.epizy.com/56875510352.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/35922304273.pdfIn PDF document text
    • http://dejanubotikepiw.rf.gd/82345324770.pdfIn PDF document text
    • http://muvubavove.epizy.com/galvanized_sheet_metal_cut_to_size.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxirefare/tamil_play_2019_new_movies.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_off0000e6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E7 5208 bytes
SHA-256: 9d1c9e3d75fdf13818d34b724d05bc419ca82acd4b663a1c4503cd8cc2249b4e
font_01_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 12144 bytes
SHA-256: 9a28b7dedcfd8ff42c6f40a88f6ece4521ab57c43630370848287b53ed6825b0

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