Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6d6b67eb8bc594…

MALICIOUS

PDF

80.8 KB Created: 2021-10-30 13:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b8fa025719f5a0989f063763dad885bf SHA-1: a050918b0683dc465b22595026bb24eca895425e SHA-256: bc6d6b67eb8bc594f6e7a0f9f76d14a90cb32609e34f52a4d1e32f8af97ca4e4
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. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains, which is a common tactic for phishing or distributing further malware. The embedded URLs and the PDF structure suggest an attempt to exploit users by directing them to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kmedebiyatgunleri.com/ckfinder/userfiles/files/85762564756.pdf In PDF document text
    • https://studiovizia.com/webroot/img/content/files/77923020369.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/8932358715.pdfIn PDF document text
    • http://tradotel-riviera.com/file/20301539964.pdfIn PDF document text
    • https://magyaringatlanadatbazis.hu/dev/_user/file/fedoweligufidipazabupes.pdfIn PDF document text
    • https://demideopool.ro/ckfinder/userfiles/files/tigepororufofixe.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/87287924902.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/6837928879.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d7f1f355096924197ff3fab9ed835220/49220582349.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/87256765161.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/seguwarufizovejolipebabe.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161670cf63692c---botapijejozap.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/rewazap.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/52027973042.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/12253217360.pdfIn PDF document text
    • https://birudongker.com/contents/files/82679062545.pdfIn PDF document text
    • https://gornjastubica.hr/files/junaxakaloguvajizemuwem.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/fibalurasilupatedimu.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/46224671190.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/67729174667.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/31240908148.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/vefigubefesa.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/pifelemimizulejikipu.pdfIn PDF document text
    • https://karthikaspices.com/uploads/file/17543115390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/D9plVHj2VOU/uplcv?utm_term=coconut+oil+ldlPDF 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_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 9932 bytes
SHA-256: 4f131d2a9c45a81dadf9be2d4bee077020fbe345a3002556e12fad9c23c631b6
font_01_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 16948 bytes
SHA-256: ec5959e0576c42c50bc13724941736d1c021927574bc25d933a73d2080e1185b
font_02_sfnt_off00011d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1