Malicious PDF — malware analysis report

Static analysis result for SHA-256 a553016b3c22e154…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 12:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 009e3ac74877a1058faabdb6d7de5f24 SHA-1: f162bb2d828734e981c953c8e16faa478bbe56bb SHA-256: a553016b3c22e1547ae74339f37a424a4a5baa9747cd27b7506f549091482d87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains a large number of embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting an attempt to direct users to malicious sites. The presence of external URIs and the link farm heuristic strongly indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://krisoc.ru/uplcv?utm_term=difference+between+sigma+and+pi+molecular+orbitals PDF link annotation
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/xawite.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/supela.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/62930856546.pdfIn PDF document text
    • http://chameleoncoupons.com/adgprocessing/uploads/files/44375873599.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/23084037837.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/54937575677.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/tadexiwakijun.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/63825512173.pdfIn PDF document text
    • http://linker-apps.com/files/63597206999.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/vifukofokobiralojive.pdfIn PDF document text
    • https://hgb.se/filer/file/juramebelaxiduvivefozikoz.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/66439537722.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/16538213954.pdfIn PDF document text
    • https://mackbeks.com/files/file/30725654771.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/1605328772.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/zudas.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/mokivewolole.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/fabufumuzabubulakemitovov.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210918_BFDDF98B286D6FB1.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/golemetemoxosevixisaxuz.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/fidokososetonomeziw.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/11578422250.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/73728307696.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_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 17100 bytes
SHA-256: 64b3c848811d9c069e7912511d0ba141c6ec495b3b09fbed4add0b005831a3e4
font_02_sfnt_off00011432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11432 11288 bytes
SHA-256: 3ab3b2c6f11d1f0e2dd77400a1adfca7806ec662414381d4f239f8831d24c04f

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