Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a4a320bd2cfb51…

MALICIOUS

PDF

75.2 KB Created: 2021-09-19 00:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 653cad3736844c89db8ccc24281356d5 SHA-1: 0208ef6a0572f28b8ea6f56dd2218bc6874e5306 SHA-256: d8a4a320bd2cfb51e78902b6dcfb7d74315eef7f37a94ba4e124c16a50fc39bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://archism.ru/uplcv?utm_term=pk+xd+mod+apk+2020+download
    • http://roycraft.ca/userfiles/file/72974448140.pdf
    • http://pokebarslo.com/uploads/files/51106219488.pdf
    • https://zippy-inc.com/app/webroot/userfiles/files/kepowazejeradak.pdf
    • http://vip-cond.ru/userfiles/file/rogipuxakamilosekosetik.pdf
    • http://tekdalyapi.com/upload/ckfinder/files/gibokavi.pdf
    • http://salespate.com/userfiles/file/57795741547.pdf
    • https://ww150001.linebot.net/upfile/files/20210917113441.pdf
    • http://www.ctnphrae.com/ckfinder/userfiles/files/ruvuretezokerubimerefut.pdf
    • http://fitviewer.com/files/file/98545074723.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/juctlqgsnejmjncibh7071tcl3/sivafek.pdf
    • http://the100voicesofgospel.de/fichiers/newsletter/file/18716046242.pdf
    • https://www.milestonesmn.org/ckfinder/userfiles/files/fomokigote.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/412b7269f4a96bac1704748ea8508053/64642996448.pdf
    • http://formpart.com/upload/ckfinder/files/benud.pdf
    • https://lochoanggia.com/upload/files/fudobuxusedekisozekexufu.pdf
    • http://alfavit.tv/userfiles/file/kisad.pdf
    • http://americansemitruckparts.com/d/files/20980959076.pdf
    • https://kfmaccounting.com/webroot/img/content/files/54678869703.pdf
    • https://get-insurance.in/ckfinder/userfiles/files/jatisoluzobad.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/38511469024.pdf
    • http://dryoucosmeceutical.com/userfiles/files/97587410411.pdf
    • http://twfbs.com/ckfinder/userfiles/files/pejatejevuxo.pdf
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/ketojigemo.pdf
    • http://libron.pl/fckupload/assets/file/xudum.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2c9.bin
9ed31750f3c3cbd78a3193666fee6419cb46f8d1a84c25752e3755ae4028c415		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C9 17352 bytes
font_01_sfnt_off0000efba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 16792 bytes
font_02_sfnt_off000107d1.bin
5fbee36a79c99ff7bbea236ef8f79cc79636e71b17c3bba67fd14003a207c8dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 10484 bytes

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