Malicious PDF — malware analysis report

Static analysis result for SHA-256 784bdb05dda6f836…

MALICIOUS

PDF

97.4 KB Created: 2021-09-14 08:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bc7ac1173e5442ce073858d4a91006d2 SHA-1: ac6239ca4092030d7e0e3cc915f58e354b68172f SHA-256: 784bdb05dda6f836b577028dc7096b1ce4f52ed00c6bb3c2f3ac04a17c14cdfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=lovecraft+rats+in+the+walls+pdf PDF link annotation
    • http://santeh.md/img/files/safivo.pdfIn PDF document text
    • https://10fci.org/userfiles/file/98754994185.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/37901970284.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/bofupewazaxevolabibizek.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/datoguzu.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/wofiwigatoduxuwituseluj.pdfIn PDF document text
    • http://jar-ted.pl/file/zipatogixigofusugakatexa.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/40d34b879003ff53d89e4851d9014033/4970933656.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b20814fb86---83763793290.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/24024126326.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/54208471022.pdfIn PDF document text
    • https://masukpt2.com/contents/files/75670832129.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/65948302459.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/valadidomozimu.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/57474548866.pdfIn PDF document text
    • https://egf.tw/test2/images/file/29186957792.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/ganoneravepefujagal.pdfIn PDF document text
    • http://digifast.cz/userfiles/kelopitovezasan.pdfIn PDF document text
    • https://ratoempat.com/contents/files/tabifoziloluzelaxax.pdfIn PDF document text
    • http://findusafranchise.com/files/files/pusejoveb.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///guforal.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_off0001163a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163A 10824 bytes
SHA-256: 5452aaa48112ba725d2e900e2c1394faf1d1484c8619ebc7ce61979c73b8619a
font_01_sfnt_off00012f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F28 18880 bytes
SHA-256: 1bbefa94c17ad0e3fbd4e219f709ed510e1251365cc9a8060d4badbcc416cbb6
font_02_sfnt_off00016028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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