Malicious PDF — malware analysis report

Static analysis result for SHA-256 c01659192f034cf8…

MALICIOUS

PDF

74.2 KB Created: 2021-09-18 13:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1dd72092790afe8f2b3475eb5eaad4c SHA-1: f37d0c587fd376a3b14db34ac3310630c05a097b SHA-256: c01659192f034cf8ddacbed2127377657e856beb44d24a20781b59aec0f5d002
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, indicating a likely attempt to distribute malicious content or phish for information. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=android+iphone+themes+free+download PDF link annotation
    • http://a-pro-peau.fr/userfiles/file/39894343757.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee9ce6f38a---76337305150.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210907035124.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/vavikor.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210902111058490093i41pf11kn31v.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/13906790372.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/bifeg.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/29416749156.pdfIn PDF document text
    • https://tivicom.vn/upload/files/kogetugexatumeperu.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/midafegosoxij.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/lisase.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614134cd80654---nesalapenavedabineme.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/sekudenatoruwijawilew.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/93447553316.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/60492571679.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/62354899167.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/77643669028.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20219165417.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/86665206437.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/forijomawarekileb.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/bovugum.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/viwosu.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/nejunis.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/89001268912.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///52456542381.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_off0000c078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC078 10832 bytes
SHA-256: 9f3af2270a19ada1c72963176b668de325c795827f17717dce35e3d111a1cc83
font_01_sfnt_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 16140 bytes
SHA-256: 449d75003e040cf479c940453aebbd87767c998d3642f83de8fddf28ffea532b

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