Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a6e1750c32eda4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 05:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f1a0beed4190c2054bb7a4ce08d4599 SHA-1: 2d910910e176ac29f8e97c9b826225a40751d81d SHA-256: 57a6e1750c32eda4cf36c9d8517db1275c7fb815b3fcb7ab593e9fa734785c4c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, suggesting an attempt to redirect users to potentially harmful content or for SEO manipulation. The presence of embedded JavaScript indicates an attempt to execute code within the user's PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jplus-ag.com/upload/files/BodyFile__613CE4E48B574.pdf
    • https://derya.afmiletisimajansi.info/resimler/files/31201673516.pdf
    • https://habibitoursegypt.com/ckfinder/userfiles/files/kiperunenax.pdf
    • https://robindayne.com/ckfinder/userfiles/files/25405176308.pdf
    • https://netiko.fr/img/Data/file/dumonum.pdf
    • http://zssadkowice.pl/pliki/30566193320.pdf
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/78186130452.pdf
    • https://profitaler.com/UserFiles/file/72020687752.pdf
    • https://purefeeling8.com/data/file/26943780108.pdf
    • http://huemin.com/fckeditor/userfiles/file/sigarij.pdf
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/11089981954.pdf
    • https://damiel.eu/userfiles/file/44134743710.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/13420037710.pdf
    • http://kahasat.cz/data/file/nataxomojezulavuxabivafox.pdf
    • http://plafondchauffant.fr/img/user/file/tizewitafagamafug.pdf
    • http://gourmethousemacau.com/UploadFilesfile///tajesakuwuzuzesebuk.pdf
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/kawejurilapujatewazeri.pdf
    • https://bimetoor.com/basefile/bimetoorir/files/51323459698.pdf
    • http://wernitznigg.at/files/feziwovo.pdf
    • https://samowar.ch/upload/file/73336589337.pdf
    • http://longchimvac.net/app/webroot/uploads/files/17335969299.pdf
    • https://masukpt1.com/contents/files/pulafage.pdf
    • http://betonkeritesek.eu/Content/files/25964064786.pdf
    • https://xistenze.nagydavid.com/files/files/guziboxefagaforokuzuwite.pdf
    • https://booknowrentalimo.ch/userfiles/files/38385628272.pdf
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/15292645756.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=my+hero+academia+season+3+dub
    • 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_off0000d221.bin
a751028c9b0f375ca34929ad198a64d274971a0806baa1151ae1f59939723f61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 11012 bytes
font_01_sfnt_off0000eb90.bin
848e5fe2e429727a029b77b028e52928468fbdc1a52e32e4a9a8f88f9aea1249		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 19820 bytes
font_02_sfnt_off00011f83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F83 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.