Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fb4bc258785631…

MALICIOUS

PDF

79.0 KB Created: 2021-02-24 01:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5b8dcc65b4bd53ecc7cf44fd374d8fbc SHA-1: 02b0b82d1d5589f6a88f6e589adcd841aacf26ff SHA-256: f9fb4bc258785631dd91ca9ab04bba726885ffed2abad221a409896beb2f0f78
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document's structure suggests it functions as a link farm, designed to lure users to external sites, potentially for phishing or further malware delivery. No scripts were extracted, but the presence of malicious links is sufficient evidence for the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=revolution+2020+short+book+review In PDF document text
    • https://cdn.sqhk.co/xerolunem/iiihgjh/32128404149.pdfIn PDF document text
    • http://physcoo.com/553384882260piqf.pdfIn PDF document text
    • https://cdn.sqhk.co/wamiratena/jhgc9hj/implosion_never_lose_hope_apk_data_download.pdfIn PDF document text
    • http://copyright-services-us.com/12242565947san3q.pdfIn PDF document text
    • https://gemexufata.weebly.com/uploads/1/3/0/7/130739895/luwonurufuxumid-kusugefoboli-fogeb-bopabixawat.pdfIn PDF document text
    • http://fruitslope.online/allotment_letter_format_under_maharerag6kd6.pdfIn PDF document text
    • http://badge-verification-center.com/jungle_boys_cartsc50f4.pdfIn PDF document text
    • https://jerarovisiva.weebly.com/uploads/1/3/5/3/135332562/rinexuzimakepa.pdfIn PDF document text
    • http://meetraisins.club/66731028667p7ky3.pdfIn PDF document text
    • https://vutameko.weebly.com/uploads/1/3/4/5/134576445/mazurizik.pdfIn PDF document text
    • http://mixed-rootwork.com/sufavowanugulerasupibgmake.pdfIn PDF document text
    • https://lowaribopuvege.weebly.com/uploads/1/3/2/8/132814272/9896837.pdfIn PDF document text
    • https://kixodebu.weebly.com/uploads/1/3/2/6/132682063/zowadaleralagugidik.pdfIn PDF document text
    • https://pofexetebi.weebly.com/uploads/1/3/4/5/134592759/ginujuwavevuremim.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/ghhhnxX/36748238619.pdfIn PDF document text
    • http://contact-git.top/66958302759itl9s.pdfIn PDF document text
    • https://cdn.sqhk.co/bevoletef/eKfW3JX/onmyoji_arena_onmyodo_guide.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/sonic_hacking_contest_2017n5n2s.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/gudukupir/2018_cadillac_xts_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/childish_gambino_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/zofimidesuzujifuxixa.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/arcon_normal_font_free.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_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 5200 bytes
SHA-256: e51b37cc407e48e2f01d10429ac1cd01f45df68a4274a036d15bd2ef3a6fe11d
font_01_sfnt_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 11616 bytes
SHA-256: 25932d64e81629a0628210c9feccfcd858bdb2e75b1034df7a208733b2d16938

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