Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d391d4eb22b9b3…

MALICIOUS

PDF

65.0 KB Created: 2021-02-24 21:24:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0f1bd063ff26945a7858042bdff50b7f SHA-1: 247ffc227f144e7bff831d66d4bbac1cbd6bf3a3 SHA-256: 84d391d4eb22b9b3c0a93c7b9f0e908d141b4a2e10ecad95a9527de9afb824fe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://jottigo.ru/strik?utm_term=hi+point+9mm+carbine+ar+stock PDF link annotation
    • https://cdn.sqhk.co/jefapukawore/jt8Upjd/71579347961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476007/normal_602816afe4c89.pdfIn PDF document text
    • http://mosemajubuj.22web.org/pokerusodapo.pdfIn PDF document text
    • http://portkamesto.site/solapomezorakajodojozejigyb0dx.pdfIn PDF document text
    • http://tefulen.iblogger.org/dubimemeb.pdfIn PDF document text
    • http://detonic-hypertonie.website/equifax_unfreeze_my_credit_reportfqzza.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/4iahd3O/mazes_more_arcade.pdfIn PDF document text
    • http://urologo.store/182657504180wz91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446273/normal_5ff09d8e3260a.pdfIn PDF document text
    • https://cdn.sqhk.co/jobezivozuf/IUihNHg/72004398739.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/Rijhhjz/liverpool_echo_lfc_app.pdfIn PDF document text
    • http://verification-help.business/28625219921evesj.pdfIn PDF document text
    • http://chambreapp.xyz/easy_english_grammar_exercises_for_beginners3blhb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503387/normal_60087fa3c7197.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zabukek.rf.gd/algebraic_fractions_worksheets_tes.pdfIn PDF document text
    • http://zapopododo.rf.gd/18052768880.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_off0000c1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AB 5368 bytes
SHA-256: 0df3427f263fd2d1a9bc79c5001523b661fd8bb3c0c444d19870d62b01114c84
font_01_sfnt_off0000d3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CD 10388 bytes
SHA-256: cfe2fc7c75d512f6ce2ac196384eae016a881df4c3a1b5db6e65784a2a9ca1ee

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