Malicious PDF — malware analysis report

Static analysis result for SHA-256 785a8581fbc69e10…

MALICIOUS

PDF

86.0 KB Created: 2021-09-12 08:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 695a7051da2fd8b1416920fc1b8b6dbd SHA-1: de0b06e40d8a49857f4685c5b9002c6f58e865f4 SHA-256: 785a8581fbc69e1037a84b9ce8c374c4bf9d3380f7fe539835d2a88c96e08126
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific 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 https://huntic.ru/uplcv?utm_term=cool+things+to+build+in+a+minecraft+town PDF link annotation
    • http://feriaalainversa.com/uploaded/files/kavuraxitirazuzeruk.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/defaxok.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/bivetawugabifededazixado.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/pavivirazawakuti.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/fowasamubo.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/90023488688.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/12590862958.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/80630222282.pdfIn PDF document text
    • https://alutat.com/data/file/dedabu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613321f159dfd---38392000570.pdfIn PDF document text
    • https://cityface.cz/res/file/85084757023.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/pototaz.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/lesaregov.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/nusisokagijedodijamalab.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/mofadazofit.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/senibibifowur.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210911_9A9A942A01FB12C4.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/22874346307.pdfIn PDF document text
    • http://licausi.it/userfiles/files/jupupadebuxinadewawu.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/tunirumap.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/2432991084.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/mafinokijiro.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d31d78062a---90584841384.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_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 17796 bytes
SHA-256: 68bcef042449888f5c05999c2db32fdf5ffbcb28719b7449ab7df9ed4f2bd922
font_02_sfnt_off00012ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF2 11280 bytes
SHA-256: 68b24733855f69931602c295e45e1bf518867390441a68e76b6af69311e43be4

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