Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa4263ffe8d0448…

MALICIOUS

PDF

85.6 KB Created: 2021-04-13 10:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c7b783ee00c345e1bac7899d735e330b SHA-1: c3f87b741715779928b5eaf200603614dd2d40ed SHA-256: 3fa4263ffe8d0448d620f33bd2a4bbe31199ec2176d775c3d919d42962dd8483
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, many of which point to disposable hosting or redirectors, suggesting a link farm designed to obscure the ultimate destination. The document body, though heavily obfuscated, contains metadata related to its creation, including a URL that appears to be part of a tracking or redirection scheme.

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://zajinet.ru/strik?utm_term=diploma+electrical+engineering+1st+semester+books PDF link annotation
    • http://gijujelebalorop.22web.org/waxezopuromidusulebeze.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/fjfcjib/febanilikazatedijuzimukip.pdfIn PDF document text
    • http://purubifo.medianewsonline.com/80174717262.pdfIn PDF document text
    • https://cdn.sqhk.co/sirepajaku/ghbihnL/criminal_hackers_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/jikikavadaja/f6hgTDW/89434152752.pdfIn PDF document text
    • http://wiboratiraveguw.mygamesonline.org/befiwe.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/fgeggi2/67890101632.pdfIn PDF document text
    • http://gavapomapo.22web.org/twinkle_twinkle_little_star_mozart_sheet_music.pdfIn PDF document text
    • http://fiziwafofekaku.mygamesonline.org/fomewekowefapesuvalal.pdfIn PDF document text
    • https://cdn.sqhk.co/simizekovogi/eidNur2/unacademy_learning_app_free_download_for_laptop.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/ieAieuh/air_hockey_table_top_replacement.pdfIn PDF document text
    • https://cdn.sqhk.co/migazajigum/6urtmpq/54532926449.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/pdf_to_cdr_file_conversion.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vubefezit.rf.gd/famobojanobatigiji.pdfIn PDF document text
    • http://kudetewususitup.rf.gd/kigesowinifawojuludokole.pdfIn PDF document text
    • http://rizukapusapanom.rf.gd/jagenesilesexoxugu.pdfIn PDF document text
    • http://voxinuxo.epizy.com/wpf_tutorial_mvvm.pdfIn PDF document text
    • http://kanisisasulaba.rf.gd/white_brick_wall_texture_free.pdfIn PDF document text
    • http://muwuvago.atwebpages.com/76955499375.pdfIn PDF document text
    • http://sesaziroderud.epizy.com/80650567493.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_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 5508 bytes
SHA-256: 46eea230d30ac04d79b3c12147854f31baef860bb968b4c809586bd8542ecbd8
font_01_sfnt_off0001224b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224B 11332 bytes
SHA-256: b34a06ff396a5c3224186f42300aa1a4bc3fb1dd1a423f3479a03cb4857d2b99

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