Malicious PDF — malware analysis report

Static analysis result for SHA-256 2804feb3d83a961d…

MALICIOUS

PDF

86.5 KB Created: 2021-09-12 06:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8c0ae4e773faeda33c1214a63b25971 SHA-1: 05f43042edb0e8c0b5ba8ded79f4796616e1985a SHA-256: 2804feb3d83a961d9a7e2dd33d2d6c68389b9de5be8ed5b890cf3993edf6a930
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to potentially disposable domains, a common tactic for phishing or distributing secondary payloads. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://srldirect.com/ckfinder/userfiles/files/72278869458.pdf In PDF document text
    • http://rayer.cn/d/files/lonetuwili.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/valit.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/52349628789.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/buxukezo.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/49503651537.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/novinup.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92462516417.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/84127406628.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab3034b682---17715931437.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/wifar.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/4312915525.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/sebeziguvuxubaxiv.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/26579638528.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/jinopadegujagadiwewemanil.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/42831888365.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/rugegovavuzen.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/vozusiket.pdfIn PDF document text
    • https://goodline.by/userfiles/file/59393553973.pdfIn PDF document text
    • http://chengzechem.com/upload/files/serekeratufevek.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/44273053929.pdfIn PDF document text
    • http://cpviettin.com/upload/files/wedesizimekikifizepusaru.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/20574953328.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/gapogopazurufadisupi.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/71530710871.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/bakuxuxabixirig.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/nodasexov.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/14534582788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+create+your+own+icon+pack+for+androidPDF 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_off0000ea1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1E 10784 bytes
SHA-256: b7a0d04efed2c631133d66b8459d02c5c92aeaae2b2d1d7f2e9f9d21b349ca78
font_01_sfnt_off00010317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 18868 bytes
SHA-256: 3af253a7d40df6abf9b6f45bb12691aabb3c7c7f27176132422244b0e1ba7995
font_02_sfnt_off000133d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1