Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef9eceadf7a6b60…

MALICIOUS

PDF

123.6 KB Created: 2021-03-04 02:31:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8ad7ba4301c2742cd8df0bf6f667e7a9 SHA-1: 22511e7c69c9c72ee9c384acc4aebeca0101673a SHA-256: fef9eceadf7a6b607f6f2144570cb10d73c07a1ab3e62b1cfb644f82e5c30318
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body's garbled text and the presence of suspicious URLs point towards an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/123?utm_term=sql+error+17008+sqlstate+08003+jboss PDF link annotation
    • http://life50it.pro/kendo_ui_grid_templatevzncr.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/eheZgcJ/sinuwezazuxomasesemag.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/kunijebi.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/harry_potter_quiz_which_character_are_you_beano.pdfIn PDF document text
    • https://kofudavobew.weebly.com/uploads/1/3/4/6/134602163/3810442.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/what_does_the_physical_activity_readiness_questionnaire_for_everyone_achieveys0vx.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/hgicdjd/destiny_s_child_survivor_album_lyrics.pdfIn PDF document text
    • https://kifajiziwezu.weebly.com/uploads/1/3/2/7/132740821/jedoj.pdfIn PDF document text
    • http://nonly.xyz/mutoguxilaliruvatuvz8.pdfIn PDF document text
    • http://fherixq.com/1545892855193it2.pdfIn PDF document text
    • http://ehaberdevlet.com/30164968894s2dpw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00018e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E11 5756 bytes
SHA-256: fb046baf107fcdaa67be3dfebed2197c8e7a6e44db03e708c14f15579f257ab0
font_01_sfnt_off0001a1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1C6 13380 bytes
SHA-256: 51d80af552fcebc6a1efa5cb7735d1d218fae253d08b003b8f3c4b32c54c052e
font_02_sfnt_off0001cbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBF2 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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