Malicious PDF — malware analysis report

Static analysis result for SHA-256 d286a2b5f07bb099…

MALICIOUS

PDF

74.0 KB Created: 2021-03-26 07:33:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 201ce9a4f6cb365cbb3038fe75650680 SHA-1: b1751d00428063a746cf7f4f595d1840133dbd71 SHA-256: d286a2b5f07bb0995ad350ad52825360f5b2df5949ded239ed5f609f8d04f022
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are likely part of a link farm designed to host malicious content. The document's apparent purpose is to trick users into clicking these links, which are disguised as resources for "audio books for spoken english free". The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://vilenefex.ru/123?utm_term=audio+books+for+spoken+english+free
    • http://yewes.space/clicker_hero_when_to_transcendmcztb.pdf
    • https://cdn.sqhk.co/nemazuwigumo/gIhajcW/viral_video_hashtags_for_youtube.pdf
    • http://degizame.iblogger.org/xovibutuda.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • http://pixerofojoka.22web.org/10274617941.pdf
    • http://reweder.site/how_to_connect_hp_deskjet_f4580_printer_to_wifi4gm2z.pdf
    • http://honbiz.pro/3964449016200tuo.pdf
    • https://cdn.sqhk.co/fosuzonarefi/1geXS1z/rigivoburuxidevuwazar.pdf
    • https://cdn.sqhk.co/javufikari/jiHmXje/hello_kitty_fun_carnival_party.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vipupirewikome.rf.gd/pabusodexukokipukef.pdf
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_b9de8ca98c4d41d99af8d899d152afbb.pdf?index=true
    • http://jozizirepimetel.rf.gd/27593355068.pdf
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_3933bd86d36e4b188ad957970cb7472b.pdf?index=true
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_a6663998a2304bc28371e51637a73ece.pdf?index=true
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_09cc61ecdea947f9b5c81c5b70c29742.pdf?index=true
    • https://9a1eab6f-da2d-4a41-99bb-18a59f11b130.filesusr.com/ugd/c2b690_79f4b351313148de8a832abe74b73505.pdf?index=true
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_6ee62d07fe884f9c89a70e991906307b.pdf?index=true
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_37961168d5a045cc8929f2b662876909.pdf?index=true
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_ff083c2105634e579ceca4d3169dcabe.pdf?index=true
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_946afc138c1e42deb64ffac795cc66a3.pdf?index=true
    • http://kimejuj.rf.gd/fagulufudelanupa.pdf
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_fe9df1dff0444102ae1c29752c17c8ae.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e48b.bin
6fd45e3feb04a04d18256374fd7796586af4a73e48a257d416ba3905ae1e7739		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 5288 bytes
font_01_sfnt_off0000f67f.bin
f39d5264b5ea7792f5cb71ce2ea59e4188890086b7c6eb83b407519101ac639a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 10540 bytes

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