Malicious PDF — malware analysis report

Static analysis result for SHA-256 031701574da94314…

MALICIOUS

PDF

80.5 KB Created: 2021-02-21 06:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 3a605f8678b010a3bfb65b2e668ba4ff SHA-1: 833d1b83e443626e78029972ded897efeb821f0f SHA-256: 031701574da943142a18460520bea0e387f3940911fe9a5f5c06d84133b83263
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/strik?utm_term=how+to+digital+art+procreate PDF link annotation
    • http://uspex22.online/vonowizizewodipasuv04bz.pdfIn PDF document text
    • https://cdn.sqhk.co/setawigiz/PnldBja/android_radio_car_settings.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/hh841hi/grandparent_christmas_gifts_ideas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369507/normal_5ff5e9a22dff6.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobigawe/amjczOG/viridian_arlington_zip_code.pdfIn PDF document text
    • https://cdn.sqhk.co/surixirulol/gd5hl3c/cytus_2_neko_lvl_25.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/gDiejhe/ninja_warrior_super_runner_games.pdfIn PDF document text
    • http://istlan.fun/44855065648im98c.pdfIn PDF document text
    • https://cdn.sqhk.co/nujudemugipi/Tjbii6W/apowersoft_background_eraser_background_editor.pdfIn PDF document text
    • http://garantiya62.ru/xasiterujowuj25g1.pdfIn PDF document text
    • http://jikalananigopun.iblogger.org/manualidades_para_navidad_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391008/normal_6025baad057e7.pdfIn PDF document text
    • http://adminhalil.com/zawusixfkx.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/wofaxil/44884436793.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/jibef.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_off0000ffd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 5116 bytes
SHA-256: 3c9fe31b5ed8005d7ce2abe714a6835f8ca02200aa9bda1597eab34a851d41e7
font_01_sfnt_off00011159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 10680 bytes
SHA-256: cfe3fe543c7170952040bcb5a8a718dc3abbcf7190d925f06cf815ade7c4b285

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