Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9695dbb797ad17…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 00:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4084cc7a2b0afbd4764fe094dca7c7db SHA-1: d9c40101a4c417d486a28f8632d73480d8e52263 SHA-256: df9695dbb797ad17d858f0021aa9bee7b26d83d50f10aafc923dc93ff6231761
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the phishing or malware distribution attack pattern. No scripts were extracted, but the presence of numerous external URIs is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=decoder+kousei+plays+apk PDF link annotation
    • http://0vote.com/ckfinder/files/57940343999.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/bukolimonimedoze.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/jikugusepusojijuxem.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/gikekiroxefefe.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/meteji.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/67931172502.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/51302909483.pdfIn PDF document text
    • https://collinite.pl/userfiles/file/winufudijikoloxonavuwiw.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/31094413798.pdfIn PDF document text
    • https://btegypt.com/file/lasizigusejujisi.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/kanokaxowuvuvejize.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/matuzipaguxuvufubaru.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/wixatewuli.pdfIn PDF document text
    • http://ceroki.com/image/files/34419417469.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/sodekunomatuwe.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/82709034287.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/68768077675.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/71995622302.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/jumitoroj.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa3200610---valotokakukepabej.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/nibanuwoj.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/gowosojuwufofiw.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/demuv.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/wajurokevunaxedakun.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_off0000d921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 10612 bytes
SHA-256: 17cbc3f4042b9a70c79741016f705089e7ec60c1d1798791d9c6da3a8921e89a
font_02_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 17292 bytes
SHA-256: 5a0316402033eb8ebe38b7e8b785ab01c981363c7e1b9d706d712d0f6e09a8a2

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