Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd6a9bf01a23fe0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 20:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f47b617fbd94ce52062f333c1feb3ee8 SHA-1: 4464456f3fa98630a4c01c7f233cd8b0601c31a0 SHA-256: 3fd6a9bf01a23fe0762bc7d077523e9b6fa34c6ad016b8dd95c7ffa87ff795e9
126 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. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially malicious sites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=burning+of+natural+gas+equation PDF link annotation
    • https://traffictkt.com/viking1/uploads/files/bikazibanewutawolexudi.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/54389gd06hhjtodcct41ln6hq2/81382159942.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210907185621.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/tupivesidivosemi.pdfIn PDF document text
    • http://ridendo.cz/files/file/sisofemenajerewasexi.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/33662693215.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/pibolajuba.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/93597530255.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/66817951295.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/13497543326.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/tonafazoremuputikatudafun.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/sogekulipolopipomisixoxa.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad4508a16---7789467299.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/60386520047.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/lifozule.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/wodomoborifasuwili.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/76223987079.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/jetokepidikubogafeme.pdfIn PDF document text
    • https://camphacement.vn/upload/files/72444688031.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/94171504322.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109072048439398.pdfIn PDF document text
    • http://weldingplaza.com/files/file/28705440326.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/26595265083.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/56545117818.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/xufaxalesamasozekarilogi.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_off0000d92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 10688 bytes
SHA-256: 103ccc619a53f6be9808e46498ada6a110d6a0ccbfc35d4034384cd4443e051d
font_02_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 16692 bytes
SHA-256: 6cae8bc5520b926a9d78efe5a9af272e1fdfc3e084755092c08f002f977ae4dc

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