Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93ea37e95c677d0…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 14:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 99ac1cb862a97f86882598d47f047aa5 SHA-1: 4029ac8f76b35717fbf6b18bd132ac073255a5bc SHA-256: b93ea37e95c677d0921d5b62a8bf96399e807c5887c72675df4d2af7667a66d8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is structured as a link farm, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a malicious workflow designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=vidmix+app+latest+version PDF link annotation
    • https://magnanerie-cazilhac.com/userfiles/file/77412497481.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/pemodulutopilagib.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f59dd9591---ziroriderogisumazo.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109051808351237.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/26309517094.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/40957104932.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/dowaxa.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/vatizozitesunegixor.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/xebasorirenanum.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/87467439786.pdfIn PDF document text
    • http://www.heksan.com.pl/file/49049989195.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/sozujepazafupux.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/lekakone.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/riforufefutiz.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/80471978484.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/80344492720.pdfIn PDF document text
    • http://redactron.com/userfiles/file/dusopezupalikez.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b324849293a810b76fae6d2e234a2b85/84948884951.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/022310385683.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/wetoralegunubomomewosa.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/kukipopodugisalebiderilam.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/40219173455.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/26232068855.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/88496053750.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_off0000d406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD406 16724 bytes
SHA-256: 9181d05e86ea1a7d1b69b9f03f2d984f8ae32728dccd55ac8d33ca0bf7f9e470
font_01_sfnt_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 10688 bytes
SHA-256: bcd0db2a99eb8ebe9e4e87577618a6486c34f7b1edd8ccb76ef008896669e871
font_02_sfnt_off0001178c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1