Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7def6ae476241ef…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 04:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7e5931ac2cd983dc77f31e0039dd121 SHA-1: a373f7ee73bc363aaf6c2c7a7edc057e3056f9cb SHA-256: b7def6ae476241ef16ed39e06d63486fc6d0c6cd1e1a7a67ab7ca21f44630edb
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. The 'SE_LOLBIN_RUN_COMMAND' heuristic further supports the idea that the document contains elements intended to execute commands or exploit vulnerabilities.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://pistant.ru/uplcv?utm_term=ff+logo+maker+pro+apk PDF link annotation
    • http://www.kickcommerce.com/userfiles/file/koperisepuzanuvav.pdfIn PDF document text
    • https://foulardfotografando.it/file/goxalegadopajin.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/defexibixusozipazejubi.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/97702002387.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d794ed0b0a26df0963ad96c58cde9974/35759448109.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/nunokefej.pdfIn PDF document text
    • https://shinaltd.ru/images/file/6121145996.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/64426121486.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109130918526259.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/99434604342.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/sizomunuwo.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/91120013404.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/59680914182.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/11786901749.pdfIn PDF document text
    • http://dentistturkey.com/image/files/bogofinokowoxigir.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475fceb7346---21852947425.pdfIn PDF document text
    • http://myphamasia.net/upload/files/kafibefevu.pdfIn PDF document text
    • http://spharma.ua/files/file/wagivanuvusuw.pdfIn PDF document text
    • https://defi128.com/userfiles/files/jesafewuratevapa.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/43947097609.pdfIn PDF document text
    • https://il-gusto.com/images/file/pazusikobizegugenatisela.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/48919592455.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/23960152975.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/nazukapedifulajepaw.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/tenixiratawavesinol.pdfIn PDF document text
    • http://0vote.com/ckfindIn macro / runtime command snippet
    • 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_off0000d67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 18400 bytes
SHA-256: 4be71ecc5e5574364f20784a8307c3b79a917d3959557539481f1af4db67a355
font_02_sfnt_off00011dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 10308 bytes
SHA-256: 0963a93c84bd3db9e32f020795e6145ddaa06276480d045d7dedb39eae93183f