Malicious PDF — malware analysis report

Static analysis result for SHA-256 9890464e2404d16c…

MALICIOUS

PDF

81.2 KB Created: 2021-05-05 20:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 832d08160acb69b7a59c461cd723aeb5 SHA-1: 780125c54a13d0158d187cd2727974165081b427 SHA-256: 9890464e2404d16c90c7019b9aec3d6ceac34c4d100262afa4984afea50657aa
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://zajinet.ru/strik?utm_term=maze+runner+chapter+1-5+summary', is presented as a lure related to 'Maze runner chapter 1-5 summary'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=maze+runner+chapter+1-5+summary
    • https://cdn.sqhk.co/gapalagabig/ibdhcgj/nufome.pdf
    • https://cdn.sqhk.co/fakodozug/db7UhcW/fesazaxurezitifoliko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/perurulexi/65599870987.pdf
    • https://s3.amazonaws.com/rawesaragegugar/how_to_turn_on_jawbone_speaker.pdf
    • https://s3.amazonaws.com/mudurixo/zkteco_access_control_software_5._3.pdf
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_adc0fd4a059147b1881a694e8f693017.pdf?index=true
    • https://s3.amazonaws.com/difigomisosak/43004332330.pdf
    • https://s3.amazonaws.com/wazotojemov/tactical_self_defense_classes_near_me.pdf
    • https://uploads.strikinglycdn.com/files/1f711369-242e-455b-846a-21974f9fc0ea/best_spanish_classical_guitar_players.pdf
    • https://s3.amazonaws.com/vonusirukete/6327605212.pdf
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_ac76615e10cb4b66bae2981cf5747f60.pdf?index=true
    • https://s3.amazonaws.com/fasomusogapovi/tafagixedinu.pdf
    • https://0621cc9e-6449-4e8a-a8bd-baee9ad62a2c.filesusr.com/ugd/affb4a_84ded965f8204ca5a92996a5b6e64415.pdf?index=true
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_e2f54d6fd796451097eed11a7e09923a.pdf?index=true
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_ad339e6d529741ffa12366ccaeca0bb0.pdf?index=true
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_c8d83112d1d046eebf664b970280af1b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5feec0db-123b-4975-ba99-fa1518b99f9f/66723939298.pdf
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_8c64e5ec0b414b5c9b3a92f0b7cef3df.pdf?index=true
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_9754c28206074b2aa41c07eb7624cd66.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6227c2df-3138-4f42-a448-8e731f26c556/30379282571.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc42.bin
ad5aa796588eebb07e125219d59a479c73edd47f77c8cb740f23fc1c4cbac397		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 5508 bytes
font_01_sfnt_off00010eff.bin
fe2b03189f2282d9621f418fac69d478b26daf49fc1f8106609edb0bfd12719a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFF 11380 bytes

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