Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3e1e2261a081b4…

MALICIOUS

PDF

84.7 KB Created: 2021-09-21 01:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a2695a1198ea502ca48fe9adc4cdc328 SHA-1: fe0ffea211e63bfa3deece7e05d224f74f2ea6a2 SHA-256: bf3e1e2261a081b4e1acea43ab3dde3ff026ac5f123a7b385510e8e9eb9b2400
206 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a link farm and a lure for clipboard command execution. The ML classifier strongly suggests maliciousness. The document body is heavily obfuscated, but the presence of a clipboard command lure suggests the intent is to trick the user into executing commands, likely to download and run a second-stage payload. The embedded URLs are suspicious and point to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://kpghomerepairs.com/uploads/image/files/61275482202.pdf In PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/42052692809.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/86312341021.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/82735381874.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/55142128412.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/91228553749.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/palakemu.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/70552642352.pdfIn PDF document text
    • https://iwistw.com/upload/files/wituvivusemixoj.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/82435228562.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74486505930.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/zukigufo.pdfIn PDF document text
    • http://centronegozi.com/public/zujefajudobofakorow.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/47829133211.pdfIn PDF document text
    • http://finchamauto.com/pics/poxerekixakasajaveg.pdfIn PDF document text
    • https://highrise.pl/file/bikigiwok.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161467430b00ed---ginitodavivofuwajewobuz.pdfIn PDF document text
    • http://e-sheremet.com/img/2010707477.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/84630471549.pdfIn PDF document text
    • https://stormester.no/files/file/mukosozalakajapolo.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/h7a6ekfbq302c50khug2023jkg/jipozikisukawore.pdfIn PDF document text
    • https://online-wums.com/files/files/1954669023.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/46409938771.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/58051729022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=apps+espias+para+android+gratisPDF link annotation
    • 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_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 10504 bytes
SHA-256: 5f87b5b0604011c0e17e97dedfaaa50dfb6fd69336e1f582266d85f348f6d4ba
font_01_sfnt_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B6 19020 bytes
SHA-256: 12f2154c3a6eb6f2fe728f1ec5a73a38c10d1387a65d002732e2ddea4c109b9d

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