Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48cb4bd8df0c67f…

MALICIOUS

PDF

87.5 KB Created: 2021-09-23 09:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6770e4a21a8acce57a39161e1a04ec8f SHA-1: 356bc7df9020a7462cf846f8b2a4cf50916a851c SHA-256: f48cb4bd8df0c67feb93d5a67623d4a9bb6025488ac0ece10f7ba441616f93b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded content are indicative of a phishing lure, likely attempting to trick users into visiting malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://misbahelmudii.org/ckfinder/userfiles/files/gumiwo.pdf
    • http://studiomuraca.eu/userfiles/files/bapudupo.pdf
    • https://partroyfuneralhome.com/partroy/assets/file/34432029841.pdf
    • http://labotinnghia.com/img/files/2353270027.pdf
    • https://h016s5or78-du3.com/contents/files/lerikozinapozutejezaj.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7b24eea6---22309092655.pdf
    • http://studiopiergentili.it/userfiles/files/raluruz.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/lajizigijebogivejibex.pdf
    • http://www.yoko-ono.be/images/userfiles/file/61283310868.pdf
    • https://techinnsrl.com/writable/public/userfiles/file/rewujujev.pdf
    • http://sonhanint.com/uploadpic/sun/files/202109101001288100.pdf
    • https://lbk-ingatlan.hu/uploads/file/kufopatifojaxinavufe.pdf
    • http://pnmanagementsolutions.in/uploads/sadifovelexi.pdf
    • https://nhahangphongcanh.com/uploads/files/zukixetilojozukekopexuzor.pdf
    • http://juentai.com/userfiles/files/pamufavimumoketuvuxisese.pdf
    • https://clifestyle.net/uploades/userfiles/file/16260302626.pdf
    • http://esistore.de/userfiles/file/78939359358.pdf
    • http://www.flamanville-76.fr/upload/file/wemuxegavajexekifu.pdf
    • http://studiotravenzolo.it/userfiles/files/90627773857.pdf
    • http://powerfalcon.net/uppic/files/65524358379.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613d65bad41d8---rugobafol.pdf
    • https://jakspravnenapsa.cz/userfiles/file/56196404052.pdf
    • https://s-serviss.lv/userfiles/file/65400687952.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+on+nokia+808
    • 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_off0000f19a.bin
ba6b364094a4e950b8c5972d1aa0a2a277d5c4fd89c4ebf218ec06f2a0a20474		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 18296 bytes
font_01_sfnt_off0001215f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1215F 16792 bytes
font_02_sfnt_off00013976.bin
ba51fd9623b371e3bce55a257b65c1e3d97f38f6bc8d33ba1e5bd60e69a6453e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13976 10200 bytes

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