Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0e8774490d7186…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 23:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 849011dc68af1b4ae1d27dc9789080ca SHA-1: e4de00c4e93fd68075c66bf331fa9e75b07b7c7d SHA-256: fd0e8774490d71868f165e5e29dcda00559bdd94db5e6166c1794962e88cb49f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifying the link farm behavior. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's part of a phishing or malware distribution chain, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://allytemp.ru/uplcv?utm_term=how+to+get+my+dog+to+stop+whining+at+night
    • http://worshipedia.net/sites/default/files/file/vamadexuz.pdf
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/dufinodilugemuduge.pdf
    • http://tplustech.com/images/ckeditor/files/34165522922.pdf
    • http://madveras.com/ckfinder/userfiles/files/lolewefuvanutekixuranaxog.pdf
    • http://sungwoneng.com/upfile_editor/2021/files/gaxagekeduvepozetuwuze.pdf
    • http://ecohouse-lab.de/userfiles/file/98512491652.pdf
    • http://atek-ent.com/upload/file/kubazononuma.pdf
    • https://ap-qatar.com/userfiles/files/15904631286.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/4136774618.pdf
    • http://cuatro-pr.org/sites/default/files/file/tazojujamegumofudib.pdf
    • http://xsteelstock.com/d/files/3610762192.pdf
    • http://yourhandmadeitems.com/userfiles/file/36657859447.pdf
    • http://tianlanip.com/filespath/files/20210901061341.pdf
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/wuduwaxinivudekoto.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d3bbd9e4b3dc9c9b5542e80e1c7bfe7f/sipezi.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kokejabukid.pdf
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/88402199738.pdf
    • https://nasikampung.info/contents/files/fenutivixegix.pdf
    • https://maribon.net/app/webroot/files/userfiles/files/lomapadamebonu.pdf
    • http://uniondrygoods.com/fckeditor/userfiles/file/17090587967.pdf
    • http://a-pluset.com/userfiles/68233123928.pdf
    • http://abnicum.com/files/file/84772681731.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_off0000de00.bin
e6269bbad2d95e6391db10fdc8213dfb582f478ebbddd01a653f8d85c97f9f3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 18528 bytes
font_01_sfnt_off00010de4.bin
06fe75d154f8fe811d12fe08ba17661412c3793f997879b414e3fa96c33d479b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE4 10884 bytes
font_02_sfnt_off000126bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126BD 16792 bytes

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