Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfc19bd7ba58e71…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 01:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e4a3b8d770469662d5d6e2ce9b43aaf6 SHA-1: a59e419857f297634252765945a12a6346f7d058 SHA-256: bdfc19bd7ba58e71cd6047d8422262ba7b381e7ecf834d428aec874997b22edb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a site that appears to be a link farm. The PDF structure and the presence of embedded URLs suggest it is designed to lure users to external, potentially malicious, websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=best+android+games+website PDF link annotation
    • http://bogaarchitetti.it/userfiles/files/sozedugitila.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/73005438127.pdfIn PDF document text
    • http://lobi.md/userfiles/file/81411290729.pdfIn PDF document text
    • http://lg-palette.com/upload/files/fasuk.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/83616964041.pdfIn PDF document text
    • https://tomas-music.com/contents/files/51897435795.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/15435068446.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/logipulupe.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/karororumoketomotefepidi.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/84654340895.pdfIn PDF document text
    • https://mklaassen.nl/images/file/78967961035.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/12/file/20210912_055924_185.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/ponurererixepug.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/35926682510.pdfIn PDF document text
    • http://strap.sk/uploads/files/bowejoduxupebif.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/10613273936.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/winetoripan.pdfIn PDF document text
    • http://timebymtm.com/upload/files/67601059773.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bec794272---lelojimosanenazopibuw.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4dcd0c7ab36b829b4b9328135e29730f/29521767454.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/80567327967.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/xagamusebe.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/viwazidolipuporit.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_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 17632 bytes
SHA-256: d81f1e5c719568a3d2cd88edbb9ef2c8b4c9bff7f2c091848e6511d0ad6d742a
font_02_sfnt_off0001293b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293B 10824 bytes
SHA-256: d4b418a3fd4f5b186cf2dc221f42444ad4d7388cbe7493bc3a09f0636abd2168

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