Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bbebed77266d56…

MALICIOUS

PDF

76.8 KB Created: 2021-09-12 08:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cb93b5d30b22cef37a8c56a95c78f350 SHA-1: 35ca16e7a4b255ca92055b44623b831a0ea87a07 SHA-256: a0bbebed77266d56697ea22e0ce4fa453bef42d92cd3c76d383c82f7636de06c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The document functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://irlanc.ru/uplcv?utm_term=free+to+choose+friedman+pdf PDF link annotation
    • http://ciarajewellery.com/editor_upload/file/382229435.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/vozakezi.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/ridomulelotagara.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/40373959431.pdfIn PDF document text
    • http://licausi.it/userfiles/files/vabolaw.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/dusenafubetu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8db20f5e14f6bb15e6c92250ef425fc5/sobexidazuzemivigajoj.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/tejorasefutaxupa.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/76544271129.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/17873459872.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210909164910_NzkyMDUwOTg0NDY=.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/59258743342.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138d3db57a6c---1220146976.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/66875977178.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/gapupunujugonilemujaxifuj.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/50937441797.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/16739939771.pdfIn PDF document text
    • http://it-hair.com/userfiles/goredarajinipu.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/22307792498.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/xurewuvofaruwatisevomidi.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/74822330810.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/ruzowuferubelikibebuvoxod.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25D 10816 bytes
SHA-256: e58c559f9076e132aec98bda1c3d88ee171a0000e60cf2327673b0fec2b78958
font_01_sfnt_off0000cb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB17 18296 bytes
SHA-256: 7f59bb5ba03773a417cb8d14663b133d04971609031e632cafe5d7f4d8cb27fd
font_02_sfnt_off0000e81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001002e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 14704 bytes
SHA-256: 99590c912e898afae1a01de19b94a77849d39c5b0a972e6f8786b3f0c0aea6ab