Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84a7e8e433bf265…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 17:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 236154c5009d798d585e458eec2d0fae SHA-1: 0273497038d9713ede52c07a3b7302a2a59e589b SHA-256: d84a7e8e433bf26543e46d76b17e43a43d2f4c7f8b426f4abc3f8bc2bb32058a
182 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains numerous embedded URLs and a heuristic indicating it's a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript and a heuristic for a 'password-protected archive handoff' further indicate a likely multi-stage attack designed to trick users into downloading and opening a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=yowhatsapp+apk+new+version+2020 PDF link annotation
    • http://jjw-led.com/userfiles/file/48061761695.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/20524357728.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/60926403938.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/jiwozebu.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/50651695860.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/68885735511.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/17100141698.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/27507732664.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613338446a748---64458263670.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/68390277440.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/93762790930.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/xowugawoliweg.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/karepitop.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/vizadop.pdfIn PDF document text
    • https://istanajp.com/contents/files/rivosofosikipoked.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/zerufi.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/37520520941.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/83441572488.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/6785489419.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613df86d7b261---nopinojovowon.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/razuvugivopejejuguni.pdfIn PDF document text
    • http://sieuthibds.net/images/files/40003520465.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/rimitebumupifutuvukisosam.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/datekapun.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/nivekusef.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_off0000d2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 16780 bytes
SHA-256: d687c659b7b80baaf542cadbdee9b49b35701fe0a718777af31cf8377b5b249c
font_01_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 10772 bytes
SHA-256: 25c200495bd9813c2873bc3967394c6094eff231c62136386759447fcd6c6f6e
font_02_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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