Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb274174eba9c786…

MALICIOUS

PDF

76.2 KB Created: 2021-02-17 23:13:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5e495eb9a65b2abb607957bed574ee56 SHA-1: 24c2ddd3bedbc0f933f25950c0b79832d22f9654 SHA-256: eb274174eba9c7862db8b4585c0550d8bcd8202dcb09da09e35b0822b1c122f5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. 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 designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/123?utm_term=craftsman+garage+door+opener+repair PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426813/normal_5fe83bec9badc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_601741fd39fc8.pdfIn PDF document text
    • https://xoxatujetila.weebly.com/uploads/1/3/0/7/130775098/6487028.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/Cs9jfhf/73729438895.pdfIn PDF document text
    • https://juputifewusa.weebly.com/uploads/1/3/4/4/134435955/4769262.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_6022fec601344.pdfIn PDF document text
    • https://cdn.sqhk.co/vomikigiw/3SWrjlR/real_color_mixer_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452618/normal_5fe1117eabd01.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/R77hbdz/dasalevazirur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408190/normal_5fcde24b5c5b6.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/PAjdFQG/download_cheat_stick_fight_shadow_warrior_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489724/normal_600baf2595bb7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445749/normal_5ff0dd540743e.pdfIn PDF document text
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/a9c43.pdfIn PDF document text
    • https://cdn.sqhk.co/zativojor/Bkcjcib/madudeziwebowojusonu.pdfIn PDF document text
    • https://cdn.sqhk.co/kawaniroti/fjd4icm/hack_game_stickman_the_flash.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_602b9d4e0870b.pdfIn PDF document text
    • https://buniburus.weebly.com/uploads/1/3/1/6/131637527/basepixiben_makinag_veviwivopudomak.pdfIn PDF document text
    • http://bunakevogipo.iblogger.org/guided_tour_lisbon_to_porto.pdfIn PDF document text
    • http://wiwomadexuza.22web.org/libasufigilujan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bipitor.epizy.com/cantos_lldm_coro_veracruz.pdfIn PDF document text
    • http://resutujimi.epizy.com/cheering_squad_uniform.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_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 5232 bytes
SHA-256: 480d1c016d4ce8def0de43402ce11dcaa114b3b61ca137585e00f6c0ebed4f34
font_01_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 10420 bytes
SHA-256: 2c2bd46c0962426c83d4a10089c5898935dbb098bbabec19502bc96a659a69d2