Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e234177119fdc8c…

MALICIOUS

PDF

83.3 KB Created: 2021-03-04 06:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 3797bd14f1d83335d84972096d7ec910 SHA-1: f6e5cfc7bca27db016bbec39a929af45f1f59691 SHA-256: 5e234177119fdc8cc328aa4ac84c66d5f6d5377ccab2d685fb8dd05e4e28b0ed
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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/wix?keyword=fluval+406+impeller PDF link annotation
    • http://xesebufawif.iblogger.org/zosuxoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/igJ6IEN/clue_game_characters_halloween_costumes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495849/normal_6023185d74fec.pdfIn PDF document text
    • https://rujijixagav.weebly.com/uploads/1/3/1/3/131383475/davam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_6030ccc63b0b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386089/normal_5fd11eac14b8e.pdfIn PDF document text
    • http://pusatokolerax.mywebcommunity.org/2005_dodge_ram_1500_slt_4.7_specs.pdfIn PDF document text
    • http://paxabak.mypressonline.com/76333630489.pdfIn PDF document text
    • https://zidesefaw.weebly.com/uploads/1/3/2/6/132680856/4ac2c3ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sevoga/64982719018.pdfIn PDF document text
    • http://kategemum.rf.gd/philosophy_quickstudy_reference_guides_-_academic.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/who_manufactures_john_lewis_sewing_machines.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/44357302651.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/wifi_authentication_problem_android_solution.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_off00010ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA6 5184 bytes
SHA-256: 7211fa9ce2bdcc500f03529b00b0dda95f61b0e48782715fc7d8375613a7d5fa
font_01_sfnt_off00011d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 10300 bytes
SHA-256: a9c8aa4d579565f0c41ef0756dd06114f0e7bef41eb019aa0e3136d94b5d60ef

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