Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccec2108b79bbf88…

MALICIOUS

PDF

77.6 KB Created: 2021-04-15 13:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5b41889b756bdc2099b3b8ec9479b8c SHA-1: 994a75a60073c9bf05ced19d567b839bb4adc049 SHA-256: ccec2108b79bbf884b82a8fd3b1ff137370826469a131299ba348cd08d4a9c17
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to environmental issues, likely to trick users into clicking the embedded malicious links.

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://dafemum.ru/strik?utm_term=problemas+ambientales+en+m%25C3%25A9xico+2019+pdf
    • https://pubagugok.weebly.com/uploads/1/3/1/3/131398253/b268ce2a40b6b0.pdf
    • http://rejamar.sportsontheweb.net/21637758615.pdf
    • http://redirerer.medianewsonline.com/diseo_generativo_asterios_agkathidis.pdf
    • https://cdn.sqhk.co/xadopazo/o1Ph35B/chakram_telugu_movie_songs_free_320kbps.pdf
    • https://cdn.sqhk.co/gepeduvo/Rejfpgf/crew_notifier_app.pdf
    • http://xilenemivagola.mywebcommunity.org/vibewejixire.pdf
    • https://cdn.sqhk.co/jesupasuzoku/Bx7Che5/gesalipatepunerotuv.pdf
    • https://cdn.sqhk.co/virurewev/ie6dtja/vuvufutemudexokuvedi.pdf
    • https://nijuvijoz.weebly.com/uploads/1/3/1/4/131408832/kuvoraw.pdf
    • https://cdn.sqhk.co/jujadiziga/jKhhiii/86549165668.pdf
    • http://midikakuvekume.mywebcommunity.org/maytag_top_load_washer_error_code_f51.pdf
    • http://zopesozali.mypressonline.com/3302250948.pdf
    • https://jutineriru.weebly.com/uploads/1/3/4/8/134866815/af270246ee.pdf
    • https://fogurasetaj.weebly.com/uploads/1/3/5/9/135961985/penuxevopixoguluv.pdf
    • https://cdn.sqhk.co/godereliku/c84ibE7/52523271967.pdf
    • http://kugaraginoja.mypressonline.com/balugepomunizipimido.pdf
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/77d4cf24c0722.pdf
    • https://cdn.sqhk.co/norumuwapa/jjL7hc3/komodurinijapusis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_2f7c7f5021f04b1d9cbbb74bf3275304.pdf?index=true
    • http://duribolatajofa.atwebpages.com/how_to_deal_with_being_depressed_in_a_relationship.pdf
    • http://ditanumugagoma.myartsonline.com/how_to_make_your_own_philosophy_of_life.pdf
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_86836ad12ee44ed5973745748f5c9c0e.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_off0000ed6e.bin
b74594fc1827b575bd6cd880be6352e603199b3e763c90fba2b992c7fad8c8f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED6E 6136 bytes
font_01_sfnt_off000101f0.bin
b5a1fcb8ddb4ce4fc98b8992dd2fa7f761dbd31fec361a9c1069fa3e9f6f2396		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 11168 bytes

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