Malicious PDF — malware analysis report

Static analysis result for SHA-256 a878f13f85a909e1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-23 17:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9eed0c9dce33bab068d589da3d096190 SHA-1: fd4b26a9a30e962ffb3a494529de47319c76e5a3 SHA-256: a878f13f85a909e136573defb2b9837ce4714abaa9c152a288cf30785d93da59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=top+anime+games+on+android
    • http://msslink.ru/userfiles/files/3027235137.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/212a15e1f110d62e548ee7f6205da62a/xenogin.pdf
    • http://dycelife.com/userfiles/file/22200638661.pdf
    • http://achilleferolla.it/userfiles/files/tivuxated.pdf
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/gaxikuduta.pdf
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/wusivoripawivifosujedoko.pdf
    • https://equalland.com/uploads/File/pakesoturitileporupi.pdf
    • http://bytip.net/filespath/files/20210920212452.pdf
    • http://www.gieskestukadoors.nl/ckfinder/files/files/xuvasoke.pdf
    • http://acsalma.hu/userfiles/files/tonogivamafexosorazejit.pdf
    • http://oris-am.com/editor_up/ledawevutifaketemuwada.pdf
    • http://optimaglobal.net/ckupload/files/luwofe.pdf
    • http://splhardware.com/UploadFile/file/2021091600460273499.pdf
    • http://botosani.ro/img/uploads/file/77614802955.pdf
    • http://dansecyr.ca/pdf/file/zeviza.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/vebopekimutam.pdf
    • https://drisraadentalcenter.com/userfiles/file/58636993837.pdf
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/81753247300.pdf
    • http://ets-sptk.ru/pic/file/wetaduj.pdf
    • https://mosallaesf.ir/uploads/ck/files/fanisipometimewof.pdf
    • http://helder-effect.nl/userfiles/file/22738965386.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/82743662575.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161322a8781b27---tiwanijagaz.pdf
    • http://abwmarlboropike.com/uploads/files/kotovumukovusawoweduma.pdf
    • https://sreekanakananda.com/ckfinder/userfiles/files/wakok.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_off0000df1b.bin
b07a59ffbcb744ed7d96f819de299cf213e3ee62f889d220e5acb79ba62fe361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 10556 bytes
font_01_sfnt_off0000f6e1.bin
4b5b4c6e7533a408f717c92637c90019c72abd0415eb699c4fe7176be489968f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 17436 bytes
font_02_sfnt_off000123e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123E5 16792 bytes

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