Malicious PDF — malware analysis report

Static analysis result for SHA-256 895a03888dc448d6…

MALICIOUS

PDF

70.5 KB Created: 2021-09-16 23:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a21f33a008c7f64f0a8ac183a9ad8ac SHA-1: 24956a2b6bad1fae31b55a90e6525ef4a93854f5 SHA-256: 895a03888dc448d6f3a9f443bb0f5306f758920b96dd6a07ae016380ef936e54
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://archism.ru/uplcv?utm_term=battle+cats+hack+no+verification+2020
    • http://stonebreaker.at/dupipasatozi.pdf
    • http://nuitsdartistes.eu/images/file/20443857769.pdf
    • http://cpviettin.com/upload/files/kemozumopinoze.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/a210037bfe20731709b1b752da81c9a4/10359150881.pdf
    • https://gastriklandsbf.se/UserFiles/files/24956957987.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/fuzifoziwaxirel.pdf
    • http://metaglas.kr/userData/board/file/4204937535.pdf
    • https://congtydaihai.com/upload/files/76254757600.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/75sk0mr5kj35ndq6oqtlaquiu4/91688600834.pdf
    • http://b40555.handyfriendship.com/upload/files/25645534284.pdf
    • https://exihomes.com/userfiles/files/gumikekokurikutika.pdf
    • http://kerekesvillszer.hu/UserFiles/file/xupikanozetademolufilape.pdf
    • http://szerecsengyogyszertar.hu/editor_up/55996116078.pdf
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/80927459536.pdf
    • https://nmg.lv/img/uploads/files/birazibovejojevopusozij.pdf
    • http://clinicaveterinariasangiacomo.it/userfiles/files/fopujepujel.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad1c.bin
f9689a23515e303311468e1d45836f0cdc8f12792bbbfadac7e4e6addcb06654		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1C 17968 bytes
font_01_sfnt_off0000db99.bin
5d32ec97bf6a49c3c994ef539befb1baa76dca8bb9a6b3cd6e5a00a18fe86d95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 10884 bytes
font_02_sfnt_off0000f4dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 16792 bytes

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