Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf02693323a30fa…

MALICIOUS

PDF

74.3 KB Created: 2021-09-30 20:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8aedd0a7ccbd62ac6c9de6ef739deef0 SHA-1: 1ef307b5496901ed2b88a239cf51f168103859dd SHA-256: 4cf02693323a30fa51240f46c39319e45635d205200893b8b89170faa55c1cbc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a likely attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://share-world.tw/userfiles/file/dufawaxinojapuniletutuzes.pdf In PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/fe76c6623f259efc497ddca1cbdd2fad/12048793403.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/8950633953.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/dadojuganesiragabijili.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/fikexuxilagukoxilow.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/kelolunepixotil.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/86786141103.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/52320429519.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/29663398739.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/88052024922.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/60561984462.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/roxijokalubogejev.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/jadozamavojemo.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/8383b85091511940b4f604efba5b145b/13122339907.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/xafifirudaweruvakilosip.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/7725538424.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/nedirojawor.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/9559726667.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/lusirikewimutuxu.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109072250168171.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/5330716646.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/zajovakaxoxonabamesexapo.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/mirosujozekorivom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bypass+google+account+apk+android+5.1PDF link annotation
    • 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_off0000b724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF36 18732 bytes
SHA-256: 86cfc4245055307db80bcf19b1588d04eec9aa6d8195b6021da569fcf0832e07
font_02_sfnt_off00010048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10048 11300 bytes
SHA-256: 36d6dc22555b245110904b766f088f92cfe1ce0c93bfdfc2f0c6f33c462f98a7