Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c953677392a78e…

MALICIOUS

PDF

75.5 KB Created: 2021-03-31 14:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d71d2c91c7e9e6052010f6edb812f46b SHA-1: d4ac09e282e6e12377d5ed80af2db39b4c9fe125 SHA-256: 12c953677392a78e1c275a990a7975a93d016925799305e87c54fb31dd41e184
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The primary URL, https://vilenefex.ru/wix?keyword=bulldog+cafe+bald+knob, is likely part of a phishing or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=bulldog+cafe+bald+knob
    • https://cdn-cms.f-static.net/uploads/4473916/normal_601975ce82098.pdf
    • http://mobufuwiwid.medianewsonline.com/29606180179.pdf
    • https://static.s123-cdn-static.com/uploads/4459641/normal_5fe57b1399fb8.pdf
    • https://xizulorojude.weebly.com/uploads/1/3/5/3/135391297/1385045.pdf
    • http://bikelumonekodex.mygamesonline.org/94657913178.pdf
    • http://bepifukikuku.mygamesonline.org/ideologies_and_social_work_murli_desai.pdf
    • http://zuxenegobepejij.22web.org/gukidexigokogiwovut.pdf
    • https://zowotojezef.weebly.com/uploads/1/3/4/3/134330732/wazew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fakuguvil/types_of_selection_answer_key.pdf
    • https://s3.amazonaws.com/wujodibu/8644422674.pdf
    • https://uploads.strikinglycdn.com/files/90e122e0-31b8-418a-adcc-d1a78de7d66e/sepewolupinezezagomibikej.pdf
    • https://s3.amazonaws.com/xapijifas/minecraft_windows_10_edition_free_android.pdf
    • http://xobiluwova.epizy.com/free_templates_for_powerpoint_2016.pdf
    • https://s3.amazonaws.com/godoremitiwuja/android_10_vs_ios_13_security.pdf
    • https://uploads.strikinglycdn.com/files/e94ea8b8-c0ef-4921-8982-296ef525ac7f/xujupukodikemakawowigimax.pdf
    • http://sosozodazu.epizy.com/accessible_design_guidelines.pdf
    • https://uploads.strikinglycdn.com/files/46d94293-8da8-480f-b6ab-87d1545997a5/xivesuvowitezamodukelabu.pdf
    • https://uploads.strikinglycdn.com/files/fa3083f0-da42-459c-be1c-be125ebb291a/janome_hd1000_accessories.pdf
    • http://pumikowexudat.onlinewebshop.net/9194538455.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd41.bin
903caaa2a639f34635cafb041976d87d2452ec9741eb8ccc13f34e2963fd52ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 4920 bytes
font_01_sfnt_off0000ee0f.bin
4cbed427b1ea8813454fff97e199a2d63479e051d4855e6080bc88840827bd03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 10720 bytes
font_02_sfnt_off000112c7.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112C7 4324 bytes

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