Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b3db71a4f4240e…

MALICIOUS

PDF

74.1 KB Created: 2021-09-26 20:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7add641cfff5b96583771396b14402ed SHA-1: d9d42ca358fad6ff08ff32275d394a0464b23cda SHA-256: a9b3db71a4f4240e915b5497a89e76f68990af33f3a6de9d6e35f836f805a98c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external PDFs hosted on various domains, a pattern indicative of a link farm designed to obscure the ultimate malicious destination. The heuristic 'PDF_RANDOM_URL_LINK' specifically points to a suspicious URL, and the ML classifier strongly flags this PDF as malicious. While no scripts were directly extracted, the structure suggests it's designed to facilitate the download of further malicious content, likely a phishing document or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ksboutlet.com/file/files/27740567023.pdf
    • http://studiorinaldibedin.eu/userfiles/files/51789729860.pdf
    • http://jtylek.pl/Upload/file/26650610122.pdf
    • http://asja-doll.ru/userfiles/file/zilewunarakorifatozepomov.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/09b0df96d877339ed01d0e0d51992166/jivovilaj.pdf
    • http://reklamavysocina.cz/UserFiles/File/57015129191.pdf
    • https://digiconelectronics.com/media/maxirefarorimeg.pdf
    • https://cargotavio.ru/files/file/merunujotatida.pdf
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/nurovimazajosibugitale.pdf
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/39197389427.pdf
    • http://mayingiabao.com/upload/files/20350185609.pdf
    • https://buyafranchise.org/files/files/tinadumaxatukozibubuti.pdf
    • https://aprilboya.com/userfiles/file/18651902890.pdf
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/68321784856.pdf
    • http://thaifilmind.com/upload/files/33776382240.pdf
    • http://personnelstrategies.net/userfiles/file/rafarasa.pdf
    • http://primeasset.hu/fileok/file/jokaki.pdf
    • https://bushregenerators.info/userfiles/files/62147583820.pdf
    • http://dtmaso.com/public_html/Imagens/file/jojazireloguzimopekoso.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe7157e1ce---liferadugomino.pdf
    • http://aardbeienfeesten.nl/uploadimages/files/wofezegatoditexofisuji.pdf
    • http://helloslow.com/data/userfiles/files/miwonidopubuxamixomibisi.pdf
    • https://zoldlaptop.hu/ckfinder/userfiles/files/5773588558.pdf
    • http://vibrobeton.by/pics/files/91356565986.pdf
    • http://ssp.by/var/upload/33562562590.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=free+sms+android+apk
    • 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_off0000bac3.bin
d141deb5c4a0d69209e0cd872224e51cd38c1fef82c4cc82ed76316af80baa53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC3 18668 bytes
font_01_sfnt_off0000eb02.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 16792 bytes
font_02_sfnt_off00010319.bin
fa27337f0a7a84ffe69d2f8151c797c5b202bb3be633f3f31f3c6618ffa4c72d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 10480 bytes

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