Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3df416feaa38102…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 10:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9884b895b4258d9ddbe272981ba377d4 SHA-1: 40c9aaeeeb2fa4819790207757d5418eeb00376e SHA-256: c3df416feaa38102db451b0c9cca0f859a462ba38a48966019de624bc480a8a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting it functions as a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports its role in directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://crewmak.ru/uplcv?utm_term=vmos+root+android+10 PDF link annotation
    • http://webinaris.training/ckfinder/userfiles/publics/files/83037194094.pdfIn PDF document text
    • http://montesantangelo.it/files/files/22712983378.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/wojowujemibefezeteruka.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/xadonokikufifi.pdfIn PDF document text
    • https://fasleh.net/Files/files/rawedutofe.pdfIn PDF document text
    • https://granitnet.hu/editor_up/89305191345.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/582ba4af08eb48bc3abeb44378fdb7a0/14507032480.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/tenadala.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/mutijisisa.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/rotomumuronoporuxu.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/131452217956.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/61444194817.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16149c75377627---36203886787.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/85852702988.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/46911380902.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/39774256818.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/mavemolezaburorozeroko.pdfIn PDF document text
    • https://10fci.info/userfiles/file/foxonibosidamono.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/94043529459.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/67298457979.pdfIn PDF document text
    • http://unityproductions.com/upload/files/lewewed.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_off0000cdab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAB 21880 bytes
SHA-256: 5a87d935b74219c3581a5fbb9a83d24056e370dc3276a38c9dd0a41f9e459afb
font_01_sfnt_off0001070a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F21 10376 bytes
SHA-256: 9596b60400409817ddff52171a373f00dc4193b20fb45d9d3a63c2fe59177175

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