Malicious PDF — malware analysis report

Static analysis result for SHA-256 261a69a6aafedf69…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 21:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 993038b061fae9de7ca7dd65c721b575 SHA-1: de65c7549afe0b62e5704fa6d2c1e12ab4aff4b0 SHA-256: 261a69a6aafedf69c7092ea707b36418a85293d33e34ff2a27320ea1d5d54920
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=dead+trigger+cheats+unlimited+money+and+gold PDF link annotation
    • https://agronlogistics.com/userfiles/files/wibejifepemos.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/kaxunatudojikukiminiz.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16308676961372905890.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161305486436ed---51101285409.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/7807510755.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/20800613910.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/66526525593.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/xuxulimevepajosikabumu.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/funabamiwujupubaloderi.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/vogetefedisodivomeduvuke.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210910_221105.pdfIn PDF document text
    • https://riwg.in/userfiles/file/33085329935.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613246a37e3ba---zixifefujuzenimetizeri.pdfIn PDF document text
    • http://partnercable.com/files/kakuxenabevebev.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/63153179987.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/vurife.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/nagevirija.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/tulizu.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/50808126445.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/viruwetib.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/zurobe.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/74647855303.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/selegozonapiveduxa.pdfIn PDF document text
    • 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_off0000c332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC332 11032 bytes
SHA-256: 831f4c2e797f6119e92850e6db4698c473f29b522bc5b12f2a38c91872250b7e
font_01_sfnt_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 16924 bytes
SHA-256: e25b55a456a0e2808eef4268a938a473e3559d5c271025dc8007f20d348f4147
font_02_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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