Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4f3f35d9b66f9e…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 12:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e2be98e4296ac5b139e080c34277ba0 SHA-1: ad9bd5331c0fecfd7f5691e9d0a4ddfaa1a2c6ce SHA-256: 3b4f3f35d9b66f9e7625bc46d9a779b06970b620d7f78388c8fbf2e31119d8a1
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with high-confidence heuristics indicating an advance-fee scam lure. The document body is heavily obfuscated, but the presence of numerous external URIs, many pointing to PDF files, suggests a downloader or redirector pattern. The primary lure appears to be a fake lottery or prize notification requiring payment for delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=free+fire+apk+data+obb
    • http://lesmashclub.com/imgUpload/files/xogowewojevidasefojuga.pdf
    • http://thietkewebbacninh.com/webroot/img/files/laganufuvotimizurozuw.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/23062204299.pdf
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/nesetikojotezi.pdf
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/noduxogewod.pdf
    • http://zatoodesign.com/userfiles/files/pawatexonifasagibe.pdf
    • https://fnb-concepts.com/images/uploads/files/27169280659.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9c1ca55fd---3269349320.pdf
    • http://kameleonhastanc.hu/files/file/mevufetobalodux.pdf
    • https://gryf-wet.pl/ckfinder/userfiles/files/8414492636.pdf
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/setimumewikonulo.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/83982257703.pdf
    • http://bagodilovaspark.hu/userfiles/file/binabeguzidixomomapu.pdf
    • http://meimagedance.tw/ufiles/files/62690104537.pdf
    • http://rpsbchamber.org/editorData/file/64864636714.pdf
    • http://elhammagazine.com/ckfinder/userfiles/files/rijosememomivef.pdf
    • https://ferropula.hr/files/26649985761.pdf
    • http://golden-candies.ru/webroot/files/files/kezufafe.pdf
    • http://mega.kz/media/upload/files/kefelidutofimobelaxig.pdf
    • http://thesciencenetwork.org/uploads/files/34978816725.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5fc250738e40b29e89fc1eb84a5d27af/demefu.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/wotaki.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_off0000ca88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA88 16792 bytes
font_01_sfnt_off0000e29f.bin
2b285272613426532e64907ef9d7b358cafc4ee60d9ed3d7e3f5fcdd30d901ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE29F 10384 bytes
font_02_sfnt_off0000f9f4.bin
e4b2a4c5c638d142b1c78a908a6b1c6f90e2ec71ef2b015b7d0a699e0c3cd43d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 17608 bytes

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