Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb54d21008321bc2…

MALICIOUS

PDF

70.9 KB Created: 2021-09-27 07:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0c9f48b4f60eb580445bffdde8133c78 SHA-1: 2f8404e552702a66a22fd68e9f6022ed830ed33e SHA-256: fb54d21008321bc2638fd2929f70a484697da43e9e5afb604de6c0bf6edcbcde
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, one of which, 'https://laborke.ru/uplcv?utm_term=gta+6+android+apk+obb+download', is presented as a lure for a game download. The PDF structure and the presence of multiple external links suggest it is part of a link farm designed to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://laborke.ru/uplcv?utm_term=gta+6+android+apk+obb+download PDF link annotation
    • https://sardavetri.it/userfiles/file/fotelog.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/14916817074.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/29911591665.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/94108637436.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/1962480320.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/tilubad.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/83438265899.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/limerefekakavimumegef.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/93092593402.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/tapematonilapuxujij.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/61767120417.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/sulawopasoroxug.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/61513681468.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/16083719906.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091317051483.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/safubanup.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/98967095618.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/fitudenuduwulonanuxud.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/koputogelamum.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/9256580245.pdfIn PDF document text
    • http://julianina.de/upload/file/gofor.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/pexewiz.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2e64d16a6---66074196796.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_off0000b1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D7 10612 bytes
SHA-256: e0c254c2e5efbf454473a6917226d101b4290be8f45fb0d584b44f0388013876
font_01_sfnt_off0000ca08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 16888 bytes
SHA-256: 7ca095299d2afe2333ceb8a29fede69ef712b228793a475b703d5a4c40141659

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