Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0bdfd6f93e94627…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 10:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bddc1d107eae85f539e528585530580c SHA-1: 4c2db5ff65e0b8b97f05603f895216c6adcf8dd1 SHA-256: a0bdfd6f93e94627353357ed28e416a4650b9339aeff8b47708eb429ebc7c038
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=doom+psx+rom PDF link annotation
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/66205065751.pdfIn PDF document text
    • http://turatabor.hu/media/jajasinurixakodumonirana.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/duvasovekulirevivo.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/80356792538.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/7299304666.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/degikidukifikate.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/54233230234.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/vudapi.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/95658802793.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/85901090d378576015aa687d6f87c7bb/26877556356.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/86614371123.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/doxupizasezesonawog.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/gowujugotumusazu.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/suzolavorubukineloxa.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///xaledoxijivolilemuzus.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/gadofidujabuladonexug.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/14925727266.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/rezelewajajiwil.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/68f9c94f4c4f6d50f9d6d4146a2e47bc/rikasimu.pdfIn PDF document text
    • https://il-gusto.com/images/file/69577920674.pdfIn PDF document text
    • http://tencanpowder.com/d/files/kukufakuliseropejo.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109130215523045.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/54791125530.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_off0000e2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC8 9880 bytes
SHA-256: 0d9b7b2075429cfa13587c6866c99fd97432e82c75aace7cfa13eeedfea6efb2
font_02_sfnt_off0001107d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 16488 bytes
SHA-256: 222301b02f48c171ee93ab33945ae07d1d6e71cb96b8a739046400b2ea03a02a

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