Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f42b12fca67312…

MALICIOUS

PDF

68.2 KB Created: 2021-09-21 10:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 23c389a74f65019e22dba2e34bb5cdb0 SHA-1: ef8faac19e823d9fd5d2465ad29188e6cc676d72 SHA-256: f9f42b12fca67312aa3fd84bd60c60037175b77f1bf657c0ec362aa33f2cbae0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these links and the high detection scores strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://medvor.ru/uplcv?utm_term=vice+city+for+android+download PDF link annotation
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/xepeked.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/lubuvogurobogojuzitivap.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/16807531430.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/wonusog.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/70357422473.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/30137949212.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/918960566.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/19288087657.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/60446603370.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210917155434.pdfIn PDF document text
    • http://efrex.cz/files/file/luzukaroromuj.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/72420003735.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/fufegamejoj.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/11968174091.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/ruxunovepikogajewi.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/77164475311.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/78609927155.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/60701586671.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9idvrph6sn4eb029olu5jl9ct5/zinokerupuvifapada.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/sutoxixujekam.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/96369454986.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/66380288219.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/tewanofexo.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364ada553a5---77618188231.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_off0000afc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC2 10472 bytes
SHA-256: d57fdf5b50e44df89e10e3d8f22f5c77b6b7c8472c6e5d2ad4009c26fc2510da
font_01_sfnt_off0000c7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD0 14276 bytes
SHA-256: f03054f77974369e9b5cd60661c0b37a219d42788a2a56049fc66f06dfce8dde

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