Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5befed6476e562f…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 00:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e9b6e2a22204fa192213545cfeaa5ba SHA-1: eae1e009c19102718885d08523a63f6a356ac793 SHA-256: f5befed6476e562fe02fab44770d9e253ae5dd29384089b6f85ecdfdc0bb8818
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially malicious or unknown domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics and URLs suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://purofirstli.com/userfiles/files/kudude.pdf
    • http://sanzmendia.com/userfiles/files/50194521175.pdf
    • http://piri-piri.pl/ckfinder/userfiles/files/lojugowolimota.pdf
    • http://bulgankhangai.mn/userfiles/files/41830442911.pdf
    • http://myhomeinparis.com/userfiles/files/5544044892.pdf
    • https://alley.52886.tw/uploads/files/87028725208.pdf
    • http://progfin.pl/userfiles/file/buvukasuvape.pdf
    • https://lesrimaudieres.com/images/uploads/file/dosokukefelowafo.pdf
    • https://abzesolar.com/uploads/files/rugupivitizesebopejakame.pdf
    • http://s2group.pl/userfiles/file/56479965497.pdf
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/54713377788.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/welofubibujowasaj.pdf
    • http://www.ap-arte.ro/fckupload/file/fumelixusadiril.pdf
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/18714169408.pdf
    • http://www.lovebliss.tw/UserFiles/files/zitulatuwej.pdf
    • http://esistore.de/userfiles/file/59188045803.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/rsisaoiedf4p9qdkih4b1a5gn6/7204604778.pdf
    • http://bioident.pl/photos_fck/file/13299922333.pdf
    • http://ccspatti.org/userfiles/file/xikuxadufutusezajet.pdf
    • http://safarang.com/basefile/files/wefefajazigo.pdf
    • http://topaslt.com/userfiles/file/384596047.pdf
    • http://abwninemile.com/uploads/files/numosu.pdf
    • http://csc025.com/userfiles/file/20210909204745_z3tdrs.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=vijay+tv+serial+latest
    • 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_off0000ad6a.bin
e8b1a45bdbc7550cce8a9906094962a5c2dfa07cbc86eaab0e0871a835f6a274		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD6A 16996 bytes
font_01_sfnt_off0000d876.bin
46ae333bf635a76cc0d0bfa070c0b7e12e972dfa904c5964aeddea0168f3c34e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD876 10156 bytes
font_02_sfnt_off0000ef43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 16792 bytes

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