Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e377b13166d15e…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 17:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 575df86c90572b6994a7fc6422cd3460 SHA-1: 3b6aabaeb8841e7e3e5397d510579b40e20c9789 SHA-256: c1e377b13166d15e00718e2ead4f9bc5c66361399caf75f28125497435e3d2c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the use of link farms on disposable hosting, supporting the phishing/malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://e68momo.com/shopadmin/upload/files/pomupi.pdf In PDF document text
    • https://zlato-invest.cz/upload/files/86960614556.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/25820421958.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/99296415964.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/tukosunatu.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/pajomefidapuwefaje.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/16228344264.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/68703521344.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/libilabibujidagomamez.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/57773697377.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/72517140872.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/wogosafotubufi.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/37085246762.pdfIn PDF document text
    • http://compsult.net/userfiles/file/6404036313.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/guzukupomuwurasujuliwuvi.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/bomezixanipalep.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613f480971826---xofijetudiwoxewomiv.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/letavisojujofilesi.pdfIn PDF document text
    • http://temple.mo/userfiles/file/rewimibupadunivuba.pdfIn PDF document text
    • http://marjoleintje.nl/include/userfiles/titebonuluxonavetonaw.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/78355420454.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0be2bc712---59114682179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=formula+of+impulsive+forcePDF 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_off0000e31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31E 18820 bytes
SHA-256: 1e9855f6b67728e00015fe89474488157687a7e4d65a5b8937e3cfc6c56b14a2
font_01_sfnt_off00011448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11448 10584 bytes
SHA-256: 8c23d6bbbd62645c97c589165ee673040c3f321129d6ce3047991675b9bb00df
font_02_sfnt_off00012c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1