Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3cbc4f27fb74a4…

MALICIOUS

PDF

81.6 KB Created: 2021-03-17 08:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ced65a443b0e284b60e507db3cb64aad SHA-1: edaf3550d5925768c60ca157117b20bcdcaaaa28 SHA-256: 8b3cbc4f27fb74a4b7a4c69cab0e1d8b6499e05474cb9751cbde190c1cffa98c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to domains associated with SEO link farms, suggesting a malicious intent to distribute further payloads or phish users. The ClamAV detection and ML classifier strongly indicate malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

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://seumenha.ru/award?keyword=animorphs+book+23+pdf
    • https://cdn.sqhk.co/togixulala/N0eRhgK/fezutibevamejan.pdf
    • https://cdn.sqhk.co/zukasedu/iQnMijA/boxitamotezamepamewar.pdf
    • https://cdn.sqhk.co/mekekomubun/hfjelwW/fofenadimujaj.pdf
    • https://cdn-cms.f-static.net/uploads/4406497/normal_6038451532f77.pdf
    • https://cdn.sqhk.co/depifozopupe/IhcgeFt/77315129651.pdf
    • https://cdn.sqhk.co/parikozug/i2jb9Zk/pirijapubirozu.pdf
    • https://cdn-cms.f-static.net/uploads/4416144/normal_5fd88ae0b6e29.pdf
    • https://cdn.sqhk.co/kosifodalab/ghjF6N9/54384927423.pdf
    • https://cdn.sqhk.co/rojarasam/xWrjdQr/amazon_kindle_fire_hd_8_plus.pdf
    • https://cdn.sqhk.co/kotoweraga/z9mbkja/birizatased.pdf
    • https://static.s123-cdn-static.com/uploads/4387821/normal_5fe38294b626b.pdf
    • https://cdn.sqhk.co/vitozogog/PJiagg6/nitro_drift._io_game.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pusolefosex/amadeus_system_software_free.pdf
    • https://s3.amazonaws.com/kovilowab/answer_2_pediatric_shoes.pdf
    • https://uploads.strikinglycdn.com/files/112ced70-c82c-44ce-9afa-93fa789b3caa/13751856404.pdf
    • https://s3.amazonaws.com/simujix/what_sd_card_for_roku_3.pdf
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_cc87a7e66b3e4b1688090ffaaeee9435.pdf?index=true
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_1ed01b6128e44798bbbd87a880c3bcf2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/85ae2e9e-527f-43d2-95c9-dbe31578fcb1/18107769185.pdf
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_336e633a0a6d4579b9aea1b62a53b552.pdf?index=true
    • https://uploads.strikinglycdn.com/files/422dc834-4b77-4531-8b97-18fd450c4885/xanifimatubowoja.pdf
    • https://s3.amazonaws.com/zepifudoxapo/school_club_registration_form_template_word.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_off00010223.bin
8d975356489cf9e07aee50f4390c7dfca10f73794e9609781045754f7352d996		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 5528 bytes
font_01_sfnt_off000114bd.bin
926c5cbf3145751149eef792abf7e71fd92eebbdb341148abfad2b477ee8133e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114BD 10728 bytes

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