Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66f6c86b36e5380…

MALICIOUS

PDF

75.6 KB Created: 2021-02-18 01:00:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c9125972d73d4f779f425682f47d95a3 SHA-1: b4cfaafa47acb95cae4d84b279407f7ac99c84ec SHA-256: f66f6c86b36e538066affa5c08fed1e8bbda3ae955049ce1b9b56bff61aae3b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=insinkerator+waste+disposal+unit PDF link annotation
    • https://cdn.sqhk.co/wujugojuse/ajiTgdZ/cheap_pink_piano_keyboards_for_sale.pdfIn PDF document text
    • https://movulejovem.weebly.com/uploads/1/3/4/4/134470355/nudus.pdfIn PDF document text
    • http://wejnpowk.space/extreme_car_racing_3deco6q.pdfIn PDF document text
    • http://mmmuuuue.space/insanity_flyff_elementor_guideevqqg.pdfIn PDF document text
    • http://usejus.club/sajejotaxapovifuo5xcv.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/yD4Fhbt/shooting_game_spaceship.pdfIn PDF document text
    • http://taher-tcac.com/boss_tpsrf51_user_manualbpmv6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415073/normal_6016fd530d4a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497078/normal_5ffeb2b484a20.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/gosuk.pdfIn PDF document text
    • http://selectgetc.top/88424131249u0ewp.pdfIn PDF document text
    • https://kesegupopu.weebly.com/uploads/1/3/4/1/134131766/af7ac3e10091e0.pdfIn PDF document text
    • http://snapchat-alert.com/nakusobowetovolakagh46uz.pdfIn PDF document text
    • http://samettemiz.xyz/76676647237kshq5.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/geb1Wii/91258577949.pdfIn PDF document text
    • http://all-system7.xyz/spongebob_squarepants_movie_scriptj66eb.pdfIn PDF document text
    • http://cookwellbakewell.com/regez071e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_60178c090dc29.pdfIn PDF document text
    • http://winoorama.website/23172215215lwcc4.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_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 5048 bytes
SHA-256: 59f4456b632645abbe8b7708bb4c2dc908ee16c8e15b66014283c212366ea85a
font_01_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 10468 bytes
SHA-256: 4d670431c47631b2c99c37bbbb73b1da4542b4bf47f4cf543a7d637e6f1873dd