Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a757a89046f532…

MALICIOUS

PDF

76.3 KB Created: 2021-09-16 09:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c6c7fd7ee71664c5e3f037c1c37512e4 SHA-1: d0f9f071d201e7be85535f981a852571dfef4bc8 SHA-256: 07a757a89046f5323dd64d5155379adfcc73e125afcd27da8614a90a19930138
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, but the overall structure and heuristic firings point towards a malicious PDF designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/uplcv?utm_term=turn+songs+into+ringtones+android PDF link annotation
    • https://hippodrome-compiegne.fr/www/uploads/file/9183743142.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109130236488786.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355ae241c53---84195225380.pdfIn PDF document text
    • https://electroagro.es/pub/files/gonosusinugatokivakubi.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/70722952182.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/darevivexu.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/zadisufekaxalukezobipe.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/pizasupivogelojew.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/nariximinananasulasabeza.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/wasaperew.pdfIn PDF document text
    • https://network-italia.it/file/woladogoxa.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/79643915576.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/6959689915.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/roronaxebakamav.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_off0000c77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77F 17608 bytes
SHA-256: 733cbd2cc13c82126e99a6934da21d9e7d60fba5a7c503d28fb8f495ebacc467
font_01_sfnt_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 10440 bytes
SHA-256: afd529a2e1330d67ce840d16cc5346f13ec47247676baebc6b7184937053ae8d

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