Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff92c0a68b8c38c…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 18:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 352b374806359a6cfdddb41fa8357fc2 SHA-1: 0d0869e035b53df970fd52380e74a9f451412831 SHA-256: aff92c0a68b8c38c24c7fbb7372228aa92b76f3dff63cabb00a1998f3a20ac7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://eros-arena.name/eros/userfiles/file/pivilapifetom.pdf
    • https://eccdc.org/application/webroot/userfiles/file/35618743875.pdf
    • https://claudiodituri.it/uploads/80504995787.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7ecd7018c---tasepamejifematomofewuw.pdf
    • http://sieuthibongda.net/ckfinder/userfiles/files/vajupofuliwow.pdf
    • http://autosoftware.company/autoresponders_images/files/firibapejafoxadi.pdf
    • http://kirakuramen.com/uploads/files/bobugeruvudulovasadonen.pdf
    • https://studiecarriere.it/uploads/file/93980978274.pdf
    • https://juniorclublivorno.com/sitonews/images_upload/files/39461743606.pdf
    • http://jgbt.us/pds/userfiles/files/pafepozelajalifivefefa.pdf
    • http://lollanaclinic.com/image/upload/File/59680914182.pdf
    • http://autosklo.sk/pictures/file/13586092728.pdf
    • https://obermeyer-modemarkt.de/upload/file/zufinobupululumokixul.pdf
    • https://mk-promotions.com/ckfinder/userfiles/files/86147780271.pdf
    • http://zdrowejaja.com/Upload/file/fosaku.pdf
    • http://v-lukomorie.com/uploader/files/wilosuxelapixajifusu.pdf
    • http://vhktn.at/images/content/files/tigojujatitixelumi.pdf
    • http://firewheels.pe/userfiles/file/3389151076.pdf
    • http://aitrans.cn/UploadFile/file/F1202109151802457065.pdf
    • https://lotteppta.net/beta/assets/file/bejale.pdf
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/tadiwenul.pdf
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/53545802511.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+know+your+phone+ram
    • 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_off0000b0bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0BD 16792 bytes
font_01_sfnt_off0000c8cf.bin
805f1b97d519ccc1bd1492e531acedc8b81d43eee4969bfbd68e4ef7dcd158f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CF 15636 bytes
font_02_sfnt_off0000f0ad.bin
95e73808680d808e1c5c0430816f10fc421e73788c394868f9773d4f99947d47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 10596 bytes

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