Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81dd16af90d390b…

MALICIOUS

PDF

84.4 KB Created: 2021-03-18 12:04:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95e49065df647956e0a75ef8c6d4c87e SHA-1: 72737041d3f0c49cc6bf675312a01418e19d151f SHA-256: f81dd16af90d390b69f5d0a8923e2c0ea38f22db1e1c6ab0ca69739c8712e069
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing. The presence of numerous URLs, including those hosted on disposable domains and file-sharing services, reinforces the phishing and potential malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=castrol+gtx+diesel+15w40+pdf
    • https://cdn.sqhk.co/fokigegoma/dibjbha/drum_machine_app_for_iphone_4.pdf
    • http://romotogez.22web.org/video_converter_for_android_2._3._5.pdf
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/9397246.pdf
    • https://cdn.sqhk.co/rodisukipi/fhhHger/50960108606.pdf
    • https://cdn.sqhk.co/xegunorasu/ifmjjhc/lefolikugef.pdf
    • https://talosemes.weebly.com/uploads/1/3/4/4/134494853/lowupogu.pdf
    • https://cdn.sqhk.co/vuramufef/iijjgge/19699181288.pdf
    • https://seruvukajobal.weebly.com/uploads/1/3/4/4/134479042/pofogarerukigik.pdf
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/tovufa.pdf
    • https://cdn.sqhk.co/tiwopaperuv/XohaUhg/tip_calculator_split_bill.pdf
    • https://cdn.sqhk.co/botonerepap/d4if3ja/police_chase_los_angeles_airport.pdf
    • https://tejikapor.weebly.com/uploads/1/3/1/3/131382395/pewiwiv.pdf
    • http://texulateniz.iblogger.org/deburepexasavamejug.pdf
    • https://cdn.sqhk.co/zivupowixede/egjJ5yY/cute_vsco_backgrounds_for_phone.pdf
    • https://cdn.sqhk.co/mesodimeduje/fhdTjay/kujuzaradezuxuwifepe.pdf
    • https://renixopofofof.weebly.com/uploads/1/3/4/4/134486295/8088989.pdf
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/lidojogepe_deronivoli_xevudixunop_pevebiduj.pdf
    • https://cdn.sqhk.co/lagidexetin/fij32g9/miralax_instructions_pediatrics.pdf
    • https://wufovepujiz.weebly.com/uploads/1/3/0/7/130775368/41776e1fca85c.pdf
    • https://mumanewuneju.weebly.com/uploads/1/3/2/7/132712109/69c288c2d7.pdf
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_a77b9b9a277e4417aeba24200b30a1ac.pdf?index=true
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_f4596380e2424c06a3bfe9966c46138d.pdf?index=true
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_336e968229a04460a6922072e1776c4d.pdf?index=true
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_db958808778341208faaceed816ee9a2.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ad4.bin
e575127969f499b7f672844e42b30fb90e254f176cb6214bf86c5abbb0cffc48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 5680 bytes
font_01_sfnt_off00011e58.bin
b36f2fc166675be4fe9bc0cce6f1f126a7177f4a2078bc3266201a8d8c13ac86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 10656 bytes

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