Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc825759e24c787…

MALICIOUS

PDF

75.5 KB Created: 2021-03-26 03:22:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: da7640f856f5770ea67f36c44d3ad123 SHA-1: 4916cc997480ad897fb8fe0cd18f35e9093e387a SHA-256: fdc825759e24c78730439bbb406836b53dad9e942ff6fba6a67987d256f33839
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to disposable domains and appear to be part of a link farm designed to redirect users. The presence of numerous external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/123?utm_term=ielts+speaking+part+3+sample+questions+answers PDF link annotation
    • http://zobotalemogi.sportsontheweb.net/wetivazideziz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375699/normal_603a8cc843736.pdfIn PDF document text
    • https://cdn.sqhk.co/mivuxakadu/fiePWJu/fifa_world_cup_rankings_2014.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/75345229278.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500889/normal_5fc8971b14274.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.pdfIn PDF document text
    • https://cdn.sqhk.co/gebitasixa/jfqhfbV/zombie_hunter_survivors_fighting_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fexiseme/VgjN61P/nepanexokekunem.pdfIn PDF document text
    • http://janexik.22web.org/garfield_comic_strips_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mekoposa/yGyghrh/99614255805.pdfIn PDF document text
    • http://lologunaw.mygamesonline.org/the_hunger_games_and_philosophy_a_critique_of_pure_reason.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_6037c9d400fe3.pdfIn PDF document text
    • http://walotapedaz.iblogger.org/52042734070.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/ibhhV48/dizobak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497650/normal_60246ffa22c6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484169/normal_605521559c19f.pdfIn PDF document text
    • http://rifivejawix.22web.org/intoxicacion_por_fenobarbital.pdfIn PDF document text
    • https://cdn.sqhk.co/mivijigonof/jehcics/20799286681.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxesabefadufu.atwebpages.com/19020806757.pdfIn PDF document text
    • http://gegilifopom.myartsonline.com/74310513421.pdfIn PDF document text
    • http://mogujuku.epizy.com/60043401642.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_off0000e90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 5520 bytes
SHA-256: fb63e285416c93667d6c05872ca51e575a6cd1a67706766fc1eee9573d69f300
font_01_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 10584 bytes
SHA-256: e8ef424e8845582bebc969656c27e40a222a38dec787ceb0253ed588a88aafd9

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