Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82795d05d0db596…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 08:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98d57e75f22b6e09ba1dec179bbd63a4 SHA-1: 282b71da8183786b5c71b20f72a98df994fa32ca SHA-256: c82795d05d0db5961be5f3adb4343b322a681a2cd00a522e4f9789d1a8ec7f45
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, presenting numerous external PDF links, likely to host malicious content or phishing lures. The presence of a 'download button' heuristic further supports a social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=nokia+lumia+1520+android+install PDF link annotation
    • http://abwfinlay.com/uploads/files/36682315083.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/jojoviwoles.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/wasogukikojodobamegogepis.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/zenigumulo.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/luraboxawaguge.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/57993449800.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/49967189261.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/nifowiwarufitog.pdfIn PDF document text
    • https://webmenuplus.com/images/file/tasovogimivukunige.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/83761343086.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/tolutar.pdfIn PDF document text
    • http://halaljones.com/uploads/files/zawanupumanofejasobi.pdfIn PDF document text
    • http://xn--lenachatka-57b.pl/uploaded/file/zomepovemevopod.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/2344842856.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/lelinolixijim.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/82651525719.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/49234258686.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/visiniwi.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/75176995328.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/80308644127.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/suremubobojekaw.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/3124109836.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/28033691791.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/91076244481.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f00711f3d6b7efdf5171c8eaf3635789/14910024702.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_off0000d3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 10872 bytes
SHA-256: 2d8af970c21e7a38ba755d31c2ff9a88e7a081004c44483748efdec8dd626a0b
font_02_sfnt_off000104f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F0 20100 bytes
SHA-256: 67acc55a01c611e549ff88fc7a24c21757206cf061fdc6c9bdbd28bc4f0f02d8