Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d964b232d965cf…

MALICIOUS

PDF

72.6 KB Created: 2021-03-01 02:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: dbbd766c40b503ecdd87017f070f63ca SHA-1: 7327e82478c2ea4bd6073b3fe60a5154d9b78ba2 SHA-256: 71d964b232d965cf1a1ad59fd8370d482eeefc7e6102863dbdf7acc084506e52
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, but the presence of external links and the heuristic findings strongly point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=how+to+auto+scan+element+tv PDF link annotation
    • https://cdn.sqhk.co/tisojubew/jg4hdie/68168941632.pdfIn PDF document text
    • http://lady-bug.club/6420952197n5b7c.pdfIn PDF document text
    • https://cdn.sqhk.co/kofosenolo/f8hcgiG/duroved.pdfIn PDF document text
    • http://vagivosifogezer.22web.org/soduf.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/gdjfFib/27328880681.pdfIn PDF document text
    • https://wufujaxuwagax.weebly.com/uploads/1/3/4/4/134400484/3d449d988d8f.pdfIn PDF document text
    • http://xajoraxi.22web.org/sql_server_database_engine_2017.pdfIn PDF document text
    • http://world-wild-shop.com/shutter_island_torrentdg1r1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://paruwegugu.rf.gd/pulenibadapame.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/63029067321.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/rukumanitazijogojeji.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/nidiweje.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_off0000e05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 4960 bytes
SHA-256: 88d76ae0c505b1bf7c425ab6637c934e5b5a205a2ab06b461e4f2de887287f11
font_01_sfnt_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 10552 bytes
SHA-256: eccbccc00c33e557197ec555912b7f15905c637eff77a7f6174788084e815959

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