Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4ad026d47a7ba8…

MALICIOUS

PDF

69.1 KB Created: 2021-09-25 15:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1ea18d5e8fa0e8ba6d062a1885b7ca73 SHA-1: 6ffb6844b41d5a7eb56affbfdc62ee3a65d0b7b8 SHA-256: db4ad026d47a7ba877df68c427f4ec823dfc94f263ad05be925f77cd3b4c6e7d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=what+is+luxury+in+fashion PDF link annotation
    • http://archidaldegan.eu/userfiles/files/30720313380.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/budemidawabinadizefokili.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/38993757369.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/69865419141.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/46162009932.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/28437238263.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/pugopusogeruxarijinafopox.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/ganifixabevefe.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/70633177674.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/xetagazakuvoxazerekipat.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/94f07d828740892702c40addb6a7a1a8/sugurigiwefagozopo.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/1879048264.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/47612566122.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/todutamivunekugipepurok.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/13954728810.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/30247482301.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee289a52a8---45825229061.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/savixopexapaparovaruka.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210904225541.pdfIn PDF document text
    • https://j26clean.com/upload/files/gimexugisaf.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_off0000ac05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC05 10488 bytes
SHA-256: 86010d81010e605e06b07eed5081d074f4952ad563516370ef24db33cab62cef
font_01_sfnt_off0000c3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DA 17476 bytes
SHA-256: 90b5c99f0e64ad8245b67f22cfcbfe85852aff82d97227e93247166693dba80b
font_02_sfnt_off0000ef49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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