Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a33bad202631ac…

MALICIOUS

PDF

92.1 KB Created: 2021-10-05 14:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2d2bc866e8003325dbb77d93bc803bfd SHA-1: c21a0f73d20fc1df3e405a7dcf2257f90fac57f3 SHA-256: e5a33bad202631acfae0754268e42128de24a9f6f36b50d32b01d47424bb8f31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external PDF files hosted on various domains, likely for SEO manipulation or to host further malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://seoaudytor.pl/userfiles/file/dazepozokuw.pdf In PDF document text
    • http://gapp.fr/medias/files/tofovakusot.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/44172134908.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/xizorofupapojupefivixi.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/49806368649.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/50456844296.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/82216262492.pdfIn PDF document text
    • http://pk.mo/userfiles/file/kujakikinedetotevewosiz.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/totuwukasozonixamoxepi.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/14152567805.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130354166baa---8158499198.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/16593942457.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/rawenodovegogarisodosir.pdfIn PDF document text
    • http://kd-council.com/upfile/files/girinap.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/54719217790.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/31278715315.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/danotapov.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/43149851555.pdfIn PDF document text
    • https://protrialse.eu/files/files/loloxixidemifemaxowaliti.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/fimuguvejefesopiw.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/lavuselunodisokusad.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/64051506671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=marilyn+manson+portrait+of+an+american+familyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 19000 bytes
SHA-256: 6dc073b44f3fdf6c73cade642b19263c6202124809a07825267f7b13c124726d
font_01_sfnt_off00013228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13228 10748 bytes
SHA-256: 52ea0ba9c49e3b78a6e60945348de250aab01540503187f26b833ae991530db3
font_02_sfnt_off00014ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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