Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f38558931b76032…

MALICIOUS

PDF

81.6 KB Created: 2020-12-05 10:07:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e9ea4ae77ba72709d562a6c039597a1a SHA-1: 8f2145c485b01aa982f7ce75b42f66ed2e58dd89 SHA-256: 4f38558931b7603283017cd8e1e7a180a6010b5b6fbdb4575ad51f37d4f74027
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, with one identified as a potential phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is indicative of a link-farming or phishing attack.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafftec.ru/123?utm_term=ratio+powerpoint+year+5 PDF link annotation
    • https://sosufafa.weebly.com/uploads/1/3/4/8/134862430/gaputolefi_dibebojo_zafux_fezijanemi.pdfIn PDF document text
    • https://mafupixalikufu.weebly.com/uploads/1/3/4/6/134662523/829a5bd374.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5b5a3c30a162e0c73770f/t/5fca822b1e3eb7471484ecb1/1607107115538/mind_music_movement.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/runorogebojenutaruru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36944f37-cc30-4c8b-b67d-9e399938029f/savannah_monitor_enclosure_plans.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/bunosudumogavu.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/2_digit_subtraction_without_regrouping_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0be061d-505c-4857-98bf-3d18a834ceb7/96055501083.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57e843398ff75154ce56f/t/5fc5e6f208845d09245703bd/1606805258939/international_association_of_administrative_professionals_summit.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/facebook_lite_app_download_pc.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5157fa04221c7117076b/1606373720279/75090061370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09075c5e-84e4-45b7-aaf8-ca9fd5afa4a1/nouveauts_en_curiethrapie_gyncologique_nouvelles_technologies.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/german_banking_system.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/tomi_sushi_buffet_san_jose.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf58b7cb3e0f5771469bbd/1606375608871/apk_downloader_extension_for_chrome_free_download.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_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 4928 bytes
SHA-256: 8068da4c1ec5d068ccf6d55084b1b9806a27624bd3aac635f4796800d8c53b17
font_01_sfnt_off000115ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AC 10484 bytes
SHA-256: 6d7db14378cf48184e788729f2959fe56a6d434f7d0c90f0a03e3b5bd64a1119

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