Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6322d4fd093774…

MALICIOUS

PDF

102.0 KB Created: 2021-02-17 16:55:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a09c400de19e9e3fa9f4a54d699e221d SHA-1: 56d928684e672fc2db101472a154b19c65e966de SHA-256: fc6322d4fd093774f88590d3190fea7c2ca4ef996c0c8fed90dfcf5620464403
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating it is part of a link farm, with numerous external links, one of which is a direct lure to a search result. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=criminal+minds+spencer+and+cat
    • https://cdn-cms.f-static.net/uploads/4407724/normal_6015cc2ed5ece.pdf
    • https://forilulan.weebly.com/uploads/1/3/1/4/131408022/bovumukomuxudo.pdf
    • https://vidokabotofasi.weebly.com/uploads/1/3/4/8/134868814/fezazedokexuso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/borokegujuzero/lixivuwovu.pdf
    • http://kimigabajo.epizy.com/udemy_app_course.pdf
    • https://s3.amazonaws.com/vapite/a_love_n_letter_whatsapp_status.pdf
    • http://matogojetize.rf.gd/cheerleading_uniforms_youth.pdf
    • https://s3.amazonaws.com/jarawaxanivu/30086778824.pdf
    • http://suzowow.rf.gd/free_able_templates_for_christmas_invitations.pdf
    • http://latuwukatagowa.epizy.com/ignou_assignment_submit_format.pdf
    • https://s3.amazonaws.com/jazamerijekufol/dewumelepuvozime.pdf
    • https://s3.amazonaws.com/dofufiri/20959547336.pdf
    • https://s3.amazonaws.com/zinudipir/rpg_games_for_android_mod_apk_offline.pdf
    • https://s3.amazonaws.com/kovezodepugov/4307825159.pdf
    • https://s3.amazonaws.com/bagokiko/work_uniform_business_casual.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012677.bin
38f2efec7563e094e8f9efe89e7a08803c4f8dbf9f38a5af6b4fea3245956916		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12677 4920 bytes
font_01_sfnt_off00013709.bin
b995b792c5c8a6de8aa9926b9fdb2564ad2aa0f1a776270dbe9334e29c4aa877		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13709 12428 bytes
font_02_sfnt_off000160c2.bin
4e6c2b02b30ddd3c9222883e36a4f67c6cee13c51c79350e05821827640e19ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160C2 18440 bytes
font_03_sfnt_off00017c91.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17C91 4324 bytes

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