Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba20b22ba46bcc99…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 14:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 300f8f3d3cb2f94cd7ae8c5754fc2397 SHA-1: 6063926e7b8b6407e00b183e0fd155ef84858e8f SHA-256: ba20b22ba46bcc996c9d4135ec2a04aacf0c7ca34ea4c984645e3f646c940836
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. Heuristics indicate it's an image-only document with an action trigger, designed to redirect users to external URLs. The presence of numerous links on disposable hosting further supports its role as a link farm for malicious redirection.

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=darth+vader+comic+pdf+download PDF link annotation
    • https://anesaportugal.org/upload/file/lurixemoragolajitugamifig.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/77252548491.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/banasesanuwolosuvotifelin.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/waxositefotupalovugemagak.pdfIn PDF document text
    • http://moretonassets.net/userfiles/vasuduluzesanakeji.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a81aed585ce91bd6ce7217faab8a941c/gogasofaket.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/96547197279.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/20773391076.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31021865954.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/sdn8rkg5qhlegd1tl8eecohmni/38734016665.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/tapolurepos.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/juzukadafeveloxop.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/56190861269.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/27093604343.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/79921124218.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/72892937574.pdfIn PDF document text
    • http://tradotel-riviera.com/file/10419706984.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/71375967350.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/87316433102.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/depana.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/69236668822.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/27417193567.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/lanurexe.pdfIn PDF document text
    • http://dongphat.net/upload/files/2969472180.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC726 14536 bytes
SHA-256: 5ae592efd7d847a19e3007680c0fc86a90ca481d8b25b384a94eab218ae132ef
font_02_sfnt_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 10868 bytes
SHA-256: e808654eec8cb0aa965183cf2143a98f23832f4f92d55082cb1d7927c1e760d0