Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6bc02a3551911c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 21:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df3b84f4a1ea1391d6e31fd53bf747ac SHA-1: 361e635d06cb0248ae9bc2c4e3f24f0fb06d2392 SHA-256: 3a6bc02a3551911c2d2a02ecf63d6f57313785c8c0fdd17b741e452bd431b95d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The presence of numerous external URIs, many pointing to PDF files on disposable hosting, further supports a link farm or phishing lure attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=pokemon+hack+no+human+verification
    • http://robalton.es/Albums/images/file///gefavarimit.pdf
    • https://anmimar.com/royal/userfiles/file/15837173890.pdf
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/22190565972.pdf
    • http://amghanoi.com/images/ckeditor/files/57004535435.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a99644321b---92175015608.pdf
    • https://shriramsteels.in/public/ckfinder/userfiles/files/pepatizaz.pdf
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/dufolividarufaxenaragudag.pdf
    • http://gazosilikatnn.ru/uploads/files/lunimuzotijul.pdf
    • https://turismopontevedra.com/ckfinder/userfiles/files/jesitokerepasumeka.pdf
    • http://thietbiotoviet.com/Images_upload/files/tivoreboseviboza.pdf
    • https://vasantviharproperties.com/userfiles/file/86323467521.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8c481d4bbb3a9f950c9eca8e238f0077/nibibijifudixizepad.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/75284872083.pdf
    • https://www.willmarshelter.com/ckfinder/userfiles/files/347096115.pdf
    • http://szhlfz.net/upload/wufilipizodeperalevipiv.pdf
    • https://keluargamimpi.com/contents/files/nafudalisemokoduzakosik.pdf
    • http://younewstoday.com/task/userimages/file/pixewutefoz.pdf
    • http://descanso.verareyes.com/ckfinder/userfiles/files/rotijosemiwazumujanub.pdf
    • http://nandishoverseas.com/UserFiles/File/rivixitaxinimawepukudav.pdf
    • http://medicapoland.pl/uploaded/file/17584968094.pdf
    • http://laulumaja.fi/ckfinder/userfiles/files/panozosepixekelasaze.pdf
    • https://atlaskvartir.ua/data/uploads/files/60335378397.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_off0000d07d.bin
5a16097c5f2afb30997aecfe45a1b62a50873a583999d885ee138855eddcaef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD07D 10644 bytes
font_01_sfnt_off0000e8b7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 16792 bytes
font_02_sfnt_off000100c9.bin
ca4fa72d4e07d05f0afff101b765fa1bcba587fcc7891c454abfdc101f2d9842		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 19008 bytes

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