Malicious PDF — malware analysis report

Static analysis result for SHA-256 07255cd8217f03e2…

MALICIOUS

PDF

73.2 KB Created: 2021-09-30 14:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9bfefff641cfe426dad00f9004f71e3e SHA-1: a7d04c338e7fa7e6d7cafafef892f969f73291f5 SHA-256: 07255cd8217f03e2133650182a7d0f116a37783bb6d195c19dcaa84ed54386a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to host malicious content or redirect users to phishing sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=how+to+compare+two+images+in+android+programmatically
    • http://donateagift.eu/userfiles/file/fidifujomefokedipubimopa.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/seziwaxadav.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca7370e3b---gutimimododalotokexiro.pdf
    • http://hifitness.hu/userfiles/file/soxuxaxeze.pdf
    • http://goghepcacloai.com/media/ftp/file/47256268019.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614651fc2d237---wexuxudefem.pdf
    • https://al-farh-iq.com/upload/userfiles/file/dijufizajozadupetawojaxu.pdf
    • http://sourceandsecure.com/uploads/userfiles/file/11891298642.pdf
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/21979585503.pdf
    • http://www.firengo.com/userfiles/files/42135957193.pdf
    • http://medical-1669.com/userfiles/files/365362422.pdf
    • http://improntediteatro.it/userfiles/files/53123327818.pdf
    • http://snieznik.pl/userfiles/file/furasa.pdf
    • https://k-barrierfree.com/FileData/ckfinder/files/20210903_B5BAF1BD0303FC94.pdf
    • http://lucchetta.net/userfiles/files/93696993559.pdf
    • http://zuche0551.com/upload/file/70198234916.pdf
    • http://www.socfertenviron.org/cmsfile/contentfiles/lisuku.pdf
    • https://astefin.ro/ckfinder/userfiles/files/22252291568.pdf
    • http://vipacademy.org/userfiles/file/595210121.pdf
    • http://cataga.de/beta/files/file/temuxuwerigaluruvedinape.pdf
    • http://www.farmaciapenil.es/userfiles/files/36564986915.pdf
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/86180167302.pdf
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/dikajedifozogujolit.pdf
    • http://pereplanirovkaoblast.ru/pict/file/18741143818.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_off0000b5e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E1 16792 bytes
font_01_sfnt_off0000cdf3.bin
71b7233ac7a39dc807e627d4a9b22ebd459bb3221eb3ee025b0e4d49ac21781e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF3 17452 bytes
font_02_sfnt_off0000fb1c.bin
4f1c697c1547d069969f1bb03ff1e6094a6fd32a7cac593b612a3182a34e85ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 11048 bytes

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