Malicious PDF — malware analysis report

Static analysis result for SHA-256 07af6dd38a520437…

MALICIOUS

PDF

79.0 KB Created: 2021-03-15 23:52:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fc0f16e31058fcf2cb25fa05939b892 SHA-1: 40faf9e4a0236ccd9e20c307ec90dcdd79346209 SHA-256: 07af6dd38a5204379de8c4188af210f211aab6a12300c3bedf4cc706a73ace4b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to benign-looking documents, but one primary URL suggests a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a trojan. No scripts were extracted, but the PDF structure itself is indicative of a link farm designed to obscure malicious activity.

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://jacksth.ru/strik?utm_term=how+to+create+a+cyberpunk+character
    • https://cdn.sqhk.co/ruvonusebex/zggjfij/kusepepitakigis.pdf
    • http://vugekowuzujed.scienceontheweb.net/how_much_weight_will_i_lose_with_gastric_sleeve_calculator.pdf
    • https://cdn.sqhk.co/fumodolanes/ij3ujji/gardenscapes_level_570.pdf
    • https://cdn.sqhk.co/rasadenibe/OPhiNhg/45771467083.pdf
    • http://jamotovoxut.mywebcommunity.org/kotosakixemebozajexe.pdf
    • http://lexamopelezun.mywebcommunity.org/craftsman_7-1_4_in._miter_saw_with_laser_trac_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8546afae-0b6b-460a-a61b-aea08e1a9455/valyrian_language_based_on.pdf
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_271c972f3e214fd9955daaf0f043426d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/aede808a-075c-47fc-a74e-d28319745ab1/febipuwukasolivenumus.pdf
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_4d37fc04d18441eb8ea5ebd9f48f31d1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a815e6b6-fb90-47d8-bcbf-b82f5832056e/lodimanujodufefolukij.pdf
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_d6192d51349544c88f4acc988d071601.pdf?index=true
    • https://uploads.strikinglycdn.com/files/40d62b17-b2b4-4807-b171-1d0b8567fb89/emerald_tablets_of_thoth.pdf
    • https://s3.amazonaws.com/dubiditiginowo/83495327262.pdf
    • https://uploads.strikinglycdn.com/files/f75b81c9-edb8-4e81-8c74-5eb632fcc13e/interpreting_graphs_worksheet_answers_chemistry.pdf
    • https://s3.amazonaws.com/desenaz/josabesufiwiroridubijenop.pdf
    • https://uploads.strikinglycdn.com/files/80820cb3-7f02-4305-aa0d-b49cf90ad512/foberu.pdf
    • https://uploads.strikinglycdn.com/files/81e26813-a031-4fd4-b243-98cc54bd7521/golejukawelirobudokikavo.pdf
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_ad49cb87afd043b0b72e07f367d4bb84.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_off0000f8a5.bin
26e000ebda5c37f391845049f1fb3d83126165e3cccfb6d0cf1044417f634b80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 5168 bytes
font_01_sfnt_off00010a49.bin
52a2185063f0088761247fbc39872a1b8f9ca39d619282fa7a9f0330223f81c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A49 10772 bytes

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