Malicious PDF — malware analysis report

Static analysis result for SHA-256 088e52c3bcc9e84a…

MALICIOUS

PDF

76.1 KB Created: 2021-03-07 10:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c9b53693051572099a3a00914c57ae45 SHA-1: 67199a79999a8a56f9a90c375eb078acb8a10858 SHA-256: 088e52c3bcc9e84a3d9e0655c587ad28b0b946fa0ac5f73aea1197a25e6d850c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, with a primary focus on directing users to 'dafemum.ru'. Heuristics indicate this PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/strik?utm_term=ap+biology+lab+report+example PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428033/normal_6035f408cfba8.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/46595647248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473916/normal_603cee84cec31.pdfIn PDF document text
    • http://wutanumijejol.sportsontheweb.net/2014_chevy_malibu_led_lights.pdfIn PDF document text
    • https://cdn.sqhk.co/xizemeginu/gilZghh/41050358218.pdfIn PDF document text
    • http://watogoda.mypressonline.com/what_type_of_yarn_is_caron_simply_soft.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_602e6e0b0b9e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_6012ee4888ef8.pdfIn PDF document text
    • https://cdn.sqhk.co/fokatekox/jd7ifV0/save_my_dog_fire_stickers.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/zhfW9so/mini_motor_racing_2_apk_uptodown.pdfIn PDF document text
    • http://medupaj.iblogger.org/rigezexalojik.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/tajimipojimo/93876529304.pdfIn PDF document text
    • http://dirazonun.myartsonline.com/hp_lj_400_m451_toner.pdfIn PDF document text
    • https://35503bd4-e3bf-42a3-b196-9304570062b9.filesusr.com/ugd/e3c460_3f3ebf1e00464a5fa4ffa31fa066a8e7.pdf?index=trueIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_477ec28d5d81495b84cdd44037398128.pdf?index=trueIn PDF document text
    • http://dajovomofoziso.rf.gd/83030211260.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/bexoxavogadelugorijev.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/55678737606.pdfIn PDF document text
    • http://jijulek.rf.gd/amitriptyline_in_pregnancy_nice_guidelines.pdfIn PDF document text
    • http://zalinejogimi.rf.gd/nafofej.pdfIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_9afc2b5e5dd542f387064b7193783204.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 5260 bytes
SHA-256: 0a97d7324b81fb25abf56a54f0afb6b2034edbc63fe46d0486d936a57c81ddea
font_01_sfnt_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 10440 bytes
SHA-256: 4d6ee36a67e0f6e53b3787043867e359f98951511b8814c32fa3b649ce172009

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