Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a322516ba60d2a…

MALICIOUS

PDF

71.6 KB Created: 2021-09-11 08:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a62f71ac427772c1ab8fe3459b82e84e SHA-1: eab619dacb984628956975e62386bd9476dfb2bd SHA-256: 25a322516ba60d2aaf11145c1e350b29a00958349aaae605c6d039290912d7bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=hack+hitman+sniper+android PDF link annotation
    • http://thermcom.cz/userfiles/file/20316056880.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/remiwaziposej.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/lujajobulalubure.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/54891991973.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109031245334852.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/21809633468.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bebda172ef---pipeku.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/zazarabebi.pdfIn PDF document text
    • https://slotpt2.com/contents/files/juvobo.pdfIn PDF document text
    • http://mega.kz/media/upload/files/vedogovokodabagazivupox.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/ruferidalurimajuxi.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/dutokaxujesisilatoko.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/58372358353.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/2344896779.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/lawozezilapa.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/87963618669.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/21628220171.pdfIn PDF document text
    • https://ckmandarin.com/uploads/7778872552.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/fisem.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/dofixoxadogevivof.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/87373213497.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a570118be8ff0ade03ca049713324f73/dezowopafexaxereburowat.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_off0000b0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F6 18804 bytes
SHA-256: ff0cc7e639e54186208b75b25db493f08df880d209190c993a0a76ce116977d9
font_01_sfnt_off0000e059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE059 10816 bytes
SHA-256: 91149287f8511e9a2aba840973715bb7eaf8c22861ede22971e8a1db29b23728
font_02_sfnt_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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