Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b878e6c876183a…

MALICIOUS

PDF

74.1 KB Created: 2021-09-10 08:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f44c7188735eb6c74894a91606e834a SHA-1: 6003ad7011a6c2d8301ed6547032bdeaa15d5b4a SHA-256: 41b878e6c876183a2dbde0bcf5ee6e794ff14a800181600020a6544a49735bb1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external URIs and is flagged as a link farm, suggesting a phishing or malware distribution attempt. The 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to download an archive, which is often used to bypass security scanning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=windows+7+loader+free+download+full+version+zip+file PDF link annotation
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89233486287.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/suzelimozajetuv.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///15589974019.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/vefinitumeki.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/84666147367.pdfIn PDF document text
    • https://medius.sk/userfiles/file/29687563429.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/55840463142.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/9628135301.pdfIn PDF document text
    • https://rais.bg/uploads/file/xibodotexi.pdfIn PDF document text
    • http://airzo.net/userData/board/file/94863084372.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904211556237108.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/bamezujajipozavut.pdfIn PDF document text
    • http://pasted-radio.de/web/files/29911352026.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/milusodudejikexegetumof.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/69104759024.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/83626619648.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/24640283394.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/dawetu.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/76861276531.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/zigatokikibuvulerepuvo.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/mubizog.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc0d216ec---lowuwazerajazib.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/13993407511.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131940053cdf---fefewemabuwuvumafofuragi.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/zilivexudi.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_off0000c071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC071 10748 bytes
SHA-256: 4fb0ddcd5223cdd0a1911f6418dfc6369fb0f172df4033edf66a869ad07a38d4
font_01_sfnt_off0000d95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 16008 bytes
SHA-256: a17c0a3ce53d4753b9ab0c0101d506790f46ac5c003a023b35ade8f8c7b2a7f1
font_02_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1