Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec5f1b5a60384bc…

MALICIOUS

PDF

80.8 KB Created: 2021-10-06 05:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8414e6730ab799947cb3a0a807cd11e3 SHA-1: 9111a6e26563c3ff6c02a58d44a8ef74a3a3eb27 SHA-256: 4ec5f1b5a60384bc2bd8c21cdc218b22d42e2e3fbda80c88c16dc8d36b5228a0
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a link farm with numerous external URIs pointing to disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be used to trick users into downloading an encrypted archive, a common tactic for evading gateway security. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=easy+cute+sketches+for+beginners PDF link annotation
    • http://duonglaohanoi.com/userfiles/file/liwifutifoz.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-28/20210928023147175907.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/48844641692.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/90797838849.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210919143514.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/jajarolovedoro.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/81203354208.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/vobuvevuromu.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/dulejuzizowanomasab.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/bememonetexakeme.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/52989794636.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/63853464603.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/67490595382.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/69433703876.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202110031025309923.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/riluxopedudojeve.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/71131484880.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/tujijafebibivesuwu.pdfIn PDF document text
    • https://clubharison.com/userfiles/file/79501148353.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/sotevaxupinipedanubunutut.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/fuxekexudufefuxevuripuwak.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/88795526051.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/xobirofetasikunonotori.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_off0000d6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FA 17232 bytes
SHA-256: ee8d601d59534ada7675c03863f7f0f3b031fe3783844b024e536cb3bba9c139
font_01_sfnt_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 10996 bytes
SHA-256: c814a40fa12301f0401de0eccf881d39eb14e416502151140e901aaf8a8d7972

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