Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef80fe0e19a926cc…

MALICIOUS

PDF

77.5 KB Created: 2021-09-24 05:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e75cfe6bdfb0588946a7176f98c3ad6 SHA-1: 8b64c782d4cc33226813a4a9468555ff9944a983 SHA-256: ef80fe0e19a926ccf8260565be2dad22186907f6aa57c65ee3e439b907036da2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://itscebu.com/upload/file/20210910080206.pdf
    • http://anoh.net/pds/userfiles/files/30112070195.pdf
    • http://www.ondebiz.com/userfiles/file/62755009342.pdf
    • https://adikkeempat.com/contents/files/lopepamedewazane.pdf
    • https://dichvumoinoi.com/ckfinder/userfiles/files/72438214887.pdf
    • http://audidalys.lt/ckfinder/userfiles/files/gepub.pdf
    • http://sjzhtchem.com/upload/files/suvorilozotuwopominafa.pdf
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/65373629391.pdf
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/geremelivubulorodilujosit.pdf
    • http://doremimarlikinsaat.com/userfiles/file/kobuvixudazazofapovuz.pdf
    • http://kiapelhrimov.cz/UserFiles/File/suzafolawewe.pdf
    • http://sluchatka-shop.cz/files/upload/files/dabaresimaribitafupukizi.pdf
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/68449083208.pdf
    • http://humidorio.de/ckfinder/userfiles/files/18847797221.pdf
    • https://hanedantoptan.com/upload/files/nuzidubusogogi.pdf
    • https://ncvpte.in/userfiles/file/27226342256.pdf
    • http://epmresearch.org/userfiles/files/90928128031.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1928926f804a16c912e23002104c7b31/45038441795.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4b45f107ea1af55750787f351bbd12ab/matigakusekamiwuj.pdf
    • https://wic-net.com/userfiles/file/ludotupo.pdf
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/pudigututenijozalewisumu.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/60852753135.pdf
    • http://grupposcorcia.it/userfiles/files/43323623357.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=kai+po+che+movierulz
    • http://s250801404.onlinehome.fr/img/uploaded/file/18842916658.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_off0000c69c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC69C 16792 bytes
font_01_sfnt_off0000deae.bin
70c094664729382ca9709f0727f3ee0834db9d23f7109a098bbdb8cca59afd8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 19312 bytes
font_02_sfnt_off00011082.bin
8206aa9c49643221441337ef67a5d9470e97f808d8cb6bb47ac188995be749ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 10488 bytes

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