Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ece3d50ddd76c07…

MALICIOUS

PDF

86.8 KB Created: 2021-09-09 23:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b998627a7c5b0244f6e20ef33bfc07b4 SHA-1: 5d5fba049a7e509238efc5bf20f1985443e25812 SHA-256: 5ece3d50ddd76c0787605733cfb7c3569efff367cf8bd8a614384df0b7acd618
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 URLs, suggesting it is used to redirect users to phishing sites or download further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=building+construction+games+for+android
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/96926643637.pdf
    • https://webhosting4.net/media/file/komovojidipebufame.pdf
    • https://brianhigbielaw.com/UserFiles/file/52977914141.pdf
    • https://aeternoplanning.com/ckfinder/userfiles/files/jupijejeriw.pdf
    • https://bimetoor.com/basefile/bimetoorir/files/51323459698.pdf
    • https://malayalamfoundation.org/admin/my_files/file/54122688060.pdf
    • https://sieuthigo.vn/upload/ck/files/wedujavajalo.pdf
    • https://lolakarimova.uz/ckfinder/userfiles/files/zuwukigivoda.pdf
    • http://skolky.info/foto/images/file/21553409936.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301b31eb7ee---wopazojemejil.pdf
    • http://luijkzonwering.nl/image/file/20246921886.pdf
    • http://olsztyntransportmedyczny.pl/userfiles/file/tobeju.pdf
    • https://davnosti.ru/upload/63935408160.pdf
    • http://andlupa.com/userfiles/file/54472858186.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e185e691---47679720589.pdf
    • http://ecole-belair.com/ecole/file/29445419377.pdf
    • http://xn--aknmedcal-wpbe.com/uploads/file/rogavazakadus.pdf
    • http://crosswaysrecruitment.com/userfiles/file/tawawukugona.pdf
    • http://columb-sklep.pl/userfiles/file/vivejuxegixojetiguteku.pdf
    • http://sokole-tps.pl/userfiles/file/meliwasifoladarexedumeme.pdf
    • http://surmounttravel.com/userfiles/files/fatejironitavejiju.pdf
    • http://mitsubishilongbien.vn/images/ckeditor/files/gufuxitofijufasumuk.pdf
    • http://aescantabria.es/upload/fckeditor/file///83663829331.pdf
    • http://platcometals.com/images/file/rexatezozuletutev.pdf
    • https://digireg.pl/upload/jerel.pdf
    • http://www.toptehnik.si/images/sajafowobenotizojopagiku.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_off0000f164.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 16792 bytes
font_01_sfnt_off0001097b.bin
0676eeb37cea0641ba26ff2608376c484bb9750ffb9a60580e6b6669d76f2231		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1097B 10972 bytes
font_02_sfnt_off000122ba.bin
b126b30f7293bcf4612fc720468fedbd8ecd0c4fb34e6b000efc77eda4dcc88b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122BA 16528 bytes

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