Malicious PDF — malware analysis report

Static analysis result for SHA-256 73917667ff2c691d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 00:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11b577ee0c8a8eaf82c5009c425c3210 SHA-1: 635f0bfb4b3bf72140fc5b15d71e625993eaddcd SHA-256: 73917667ff2c691d0eb05d987945355c710e28c566d0599782baa6dc3a525d1c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is part of a link farm, and numerous unknown URLs were extracted, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crabandclaw.com/uploads/files/78158363407.pdf
    • http://huichem.com/ckfinder/userfiles/files/sivotuzewubopijagowo.pdf
    • http://nuitsdartistes.eu/images/file/41647529682.pdf
    • http://metzlerranch.com/userimages/31568680527.pdf
    • http://sushinamu.com/uploads/files/mogelulanufikulomafataf.pdf
    • http://www.golfusa.be/userfiles/files/10504356323.pdf
    • http://bk-plus.at/userfiles/files/siwobudox.pdf
    • http://eluvial.com/sites/all/sites/eluvial.com/files/xasurito.pdf
    • http://p-itos.net/admin/userfile/image/file/juxaxemura.pdf
    • https://penal-garazh.ru/files/tikevewageto.pdf
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/92382087725.pdf
    • https://g4m3s-4p1-12s1.com/contents/files/waxonolipukolijofi.pdf
    • http://tokstar.com/_UploadFile/Images/file/zibujulofileseteros.pdf
    • https://aymfly.com/aym_image/files/4159458921.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147bd4e50fcf---14782623178.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/93618388367.pdf
    • http://eclickapps.in/userfiles/files/33428018443.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7fjhunruev1irqd6dkk7618r0e/kovokekawen.pdf
    • http://asia-test.informacittadino.net/media/files/dagiwefilenewubiwabuj.pdf
    • https://dennismaloney.ca/upload/editor/file/31484628884.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=naijanet+hollywood+movies+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71c.bin
94aff8fa7543993456b0178616565ec657e0cb2c7db6ed114ebb7109d1121be3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 17476 bytes
font_01_sfnt_off00011488.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11488 16792 bytes
font_02_sfnt_off00012c9f.bin
5b752edc0e8f8feea5bee79ae462bad6d53e699d8569727bfd436dfd4a913f3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9F 10788 bytes

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