Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7279ac8a2eee80…

MALICIOUS

PDF

77.9 KB Created: 2021-03-06 05:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b7995a6610b16076d8838256ce56ac7 SHA-1: ba6684f3f48084df8f541c8f0351ec933d217561 SHA-256: aa7279ac8a2eee80158a5418731589c595db8689449a7711dcaa333229738871
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary focus on directing users to 'pelibifir.ru'. This URL is flagged as suspicious and is presented within the document body under the guise of a 'story video'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting a tactic to increase visibility or distribute malicious content. ClamAV and ML classifiers also identify this PDF as malicious, likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/award?keyword=the+birds+and+the+bees+story+video
    • https://cdn.sqhk.co/sobupepokor/hCfjfVQ/vabumuz.pdf
    • https://cdn.sqhk.co/nugizape/tkihij7/4114767588.pdf
    • https://cdn.sqhk.co/jejefudebuxi/jhHgfjg/pixel_art_builder_for_minecraft_ios.pdf
    • https://vazejaxos.weebly.com/uploads/1/3/1/3/131382607/12f58647d.pdf
    • https://pasadaxadug.weebly.com/uploads/1/3/5/3/135390708/feguvij.pdf
    • https://faruroju.weebly.com/uploads/1/3/5/9/135986438/4c8f519f042049d.pdf
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/9730927.pdf
    • https://wuzizado.weebly.com/uploads/1/3/5/4/135401221/labifeti.pdf
    • https://cdn.sqhk.co/sovajepuxe/HjgIcih/zeguduxemuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1012a8c2-b531-46d3-b3bb-69c6dc8cc3e1/korosotoval.pdf
    • https://uploads.strikinglycdn.com/files/f431a1c0-b9b7-4654-b313-5c1de690c480/what_is_sbm_in_deped_philippines.pdf
    • https://s3.amazonaws.com/nefagolom/xivukikotokobega.pdf
    • https://s3.amazonaws.com/ropidadegaxut/emotional_love_status_telugu.pdf
    • https://s3.amazonaws.com/laginekux/weterek.pdf
    • https://s3.amazonaws.com/woxorojero/83271928634.pdf
    • https://uploads.strikinglycdn.com/files/a7b9abe2-18a6-4810-8477-3e9b00dc086d/devupigatedef.pdf
    • https://s3.amazonaws.com/ninasivol/tulepatokoxesosuk.pdf
    • https://s3.amazonaws.com/pevarijidasalop/8035364108.pdf
    • https://s3.amazonaws.com/xonaxevetaf/coliformes_totales_en_agua_potable.pdf
    • https://s3.amazonaws.com/bifadiwuwileji/star_trek_enterprise_archer_and_tpol_fanfiction.pdf
    • https://s3.amazonaws.com/fukepez/kokivajokawiwalebudo.pdf
    • https://uploads.strikinglycdn.com/files/eb85cfec-5fd3-40b1-b56b-3738e4d8fb81/child_of_the_dark_sparknotes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f556.bin
219b08e6fc4b49db28c414efd68bfd1d8d75bea1eacb2854852b24d80011778a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 5132 bytes
font_01_sfnt_off000106c3.bin
8c9ae0996f4d30347456ebb28d32f5ad2fbfb941880c91586bf2e295703b7e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C3 10364 bytes

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