Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fea7d3301fb13cf…

MALICIOUS

PDF

71.4 KB Created: 2021-02-28 03:04:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3f9c39861f10364a366c0575ab0aa2af SHA-1: 460d9ea6a54720a75714045edb750cb359af69c2 SHA-256: 3fea7d3301fb13cf746077b12de4171eab0cbe59fc10883dde6b523fae75f481
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via the embedded links. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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://jacksth.ru/award?keyword=dresden+files+tv+show+imdb PDF link annotation
    • http://badgesverified.com/woodworker_s_journal_reviewvmprn.pdfIn PDF document text
    • http://starkrobotics.org/cv_sample_format5q8nk.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/zemutidesim.pdfIn PDF document text
    • http://activa-fb.com/is_there_a_22_ammo_shortagehxwjw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388611/normal_5fe32070d03df.pdfIn PDF document text
    • http://dmgameplan.com/pitosukikgrwwt.pdfIn PDF document text
    • http://labincom-med.ru/how_to_increase_speed_on_2014_club_car_precedent20pqi.pdfIn PDF document text
    • http://wdd13.ru/wusabe3hm2i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_603631993740d.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/reporter_salary_ukp5k5s.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/lifamivatepozezupix.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/fios_quantum_gateway_router_speed.pdfIn PDF document text
    • http://changely.club/bartok_mikrokosmos_vol_1_imslpwpma4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/towutoginadivu/sogafozorog.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/weather_report_bekasi_indonesia.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFA 5016 bytes
SHA-256: 4a9492def9b28b1af3493ec03fec6a7eaa0d3f51aa47d4162194994735827b8e
font_01_sfnt_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 10168 bytes
SHA-256: 7f4eb0e3a828215a5fee5adccd0b605c1e4ae0cf7d55cfc47cd9354f6ba10290
font_02_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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