Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad357f81f128787a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 22:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f9708143f6aef055e77542ccd2368f74 SHA-1: c505e8b58275e14a4cf5e9a931693b6dc9fab586 SHA-256: ad357f81f128787a19595e86f7a1501a64d4a78758c85b6291cd463a72d3d0b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure indicate an attempt to exploit user trust for malicious purposes, likely through phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=life+and+death+stephenie+meyer+pdf PDF link annotation
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/xufugudetizemevifaw.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/34675012203.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210920100211425769ioj66.pdfIn PDF document text
    • http://mamitobe.ru/files/file/jatowerusela.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/14298805274.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/deverugitukojimirojezara.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/bugiwevew.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/70269695584.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/gurugesaka.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/gojitinite.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/67995090906.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/fevawibaworupazutux.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/torisubojo.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/f9b1e116b2b6a631cbd205feff431495.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/66102501044.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/476a00387ee2e071966db0e7d1556d34/fojomuwofeporasovogef.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/kelasikawagotemebamosate.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/jazefitifulix.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/80493128619.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/jakegomutebetusiwalolinap.pdfIn PDF document text
    • http://gestionarival.com/userfiles/file/nezuwodusosinilo.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/13965061205.pdfIn PDF document text
    • http://baove24h.info/upload/files/momukatepadil.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_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 10668 bytes
SHA-256: a7dc1f4c74c50805d1d816d269a644fc8d90ade7a4a6136e34132f1a1639cc3f
font_02_sfnt_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 17540 bytes
SHA-256: 06efdf08ad4a81f88a28f299ca431471e9cd50d643f2a27e6ac8f4cd8f7a9948

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