Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8d34f88d209290…

MALICIOUS

PDF

78.0 KB Created: 2021-02-24 02:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 70114ca54c2a7ea190e138d56bfca1c1 SHA-1: 9da9d05e27168abe0dad646e8bda579b082a1815 SHA-256: bb8d34f88d20929033af5982627994acc9549323985702fc25a72adbb845bab8
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/aws?utm_term=lexus+is300+v8+engine+swap PDF link annotation
    • https://cdn.sqhk.co/rikopekela/gjGhehb/pro_series_drag_racing_tunes_funny_car.pdfIn PDF document text
    • https://gidafefutor.weebly.com/uploads/1/3/4/0/134040883/nunejatewipek.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/drjahdi/occupational_therapy_vs_physical_therapy_assistant.pdfIn PDF document text
    • https://cdn.sqhk.co/pigujoxexate/n6ogjml/33783822228.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/xhhhcgf/xarovisefusesevaximubikip.pdfIn PDF document text
    • https://wujadadi.weebly.com/uploads/1/3/1/0/131070572/2d52cd66b866a2.pdfIn PDF document text
    • https://boxuxalido.weebly.com/uploads/1/3/0/8/130814411/7586551.pdfIn PDF document text
    • https://zogeliwev.weebly.com/uploads/1/3/4/3/134353139/6be6a63d1b02db0.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/jbqje1W/animated_zombie_wallpaper_phone.pdfIn PDF document text
    • https://bovikobugekut.weebly.com/uploads/1/3/0/7/130775803/5784383.pdfIn PDF document text
    • https://cdn.sqhk.co/raguwubives/vijIZjb/52477460094.pdfIn PDF document text
    • https://lisufijefe.weebly.com/uploads/1/3/2/7/132740260/sipibaximuzewopi.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/CdThdAS/bezier_games_one_night_ultimate_werewolf_board_game.pdfIn PDF document text
    • https://tuwunofibe.weebly.com/uploads/1/3/4/6/134657164/gezuwexakuxiwov.pdfIn PDF document text
    • https://cdn.sqhk.co/mozopojugode/NgtjhZw/ramimeni.pdfIn PDF document text
    • https://zezuwosizu.weebly.com/uploads/1/3/4/4/134459619/1210890.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/jeWYhaa/dimobitufemixudilumowug.pdfIn PDF document text
    • https://cdn.sqhk.co/bibilofefi/Hgc0jjC/13407826089.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 5520 bytes
SHA-256: 92e8b74dba9c542a5b5283f8e1cb88a50eb2cf7ca28f6f64336bdd39dc845897
font_01_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 11284 bytes
SHA-256: 49ce2cb5051ebf39a5dc4b4ecbd208da6e1416bfeb3a2f6852ce3367954d1115

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