Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70c9e6dcfb731fa…

MALICIOUS

PDF

77.6 KB Created: 2021-03-19 19:50:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d209b2554938c17609b518ccd5c1133e SHA-1: 1fd048719689a73c7e8ad6ebe50b6c42efb5f54c SHA-256: a70c9e6dcfb731fa2a8daa5da5cb71008c7ac613719144d075a03bd956e685bc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, suggesting a phishing or SEO poisoning attack. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing trojan. The embedded URLs, such as 'https://druttle.ru/strik?utm_term=processing+time+for+190+visa+act', are likely used to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=processing+time+for+190+visa+act
    • http://xalenupom.getenjoyment.net/world_important_days_in_tamil.pdf
    • https://cdn-cms.f-static.net/uploads/4452593/normal_601b002a7468c.pdf
    • http://kutejovanog.getenjoyment.net/quit_smoking_the_easy_way_audiobook.pdf
    • https://cdn-cms.f-static.net/uploads/4375355/normal_60224dc674f16.pdf
    • https://cdn-cms.f-static.net/uploads/4450337/normal_5fdb544749764.pdf
    • http://medilawibume.scienceontheweb.net/79302699114.pdf
    • https://static.s123-cdn-static.com/uploads/4471514/normal_5ff7f6160a551.pdf
    • http://kevekozulanilim.sportsontheweb.net/516574322.pdf
    • https://cdn-cms.f-static.net/uploads/4506159/normal_600b72e46bcb6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_ebdc9b9d105e489c97dde148acdda803.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3e7876e8-dece-4275-8819-876c15c43a22/how_to_put_baby_in_ergo_360_on_back.pdf
    • https://uploads.strikinglycdn.com/files/7df9a051-318a-4218-b1b2-854f1d50d00f/84225567454.pdf
    • https://uploads.strikinglycdn.com/files/e4d2a7e4-725a-4d1d-b647-5dc82025aaa5/passkey_ea_review_complete.pdf
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_54ff8302b51f4de8985a6212ab04cfb8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/771611c7-8251-49e6-8039-528c93e71cae/pioneer_4100nex_reset_button.pdf
    • https://uploads.strikinglycdn.com/files/50b54d44-73f6-47ee-8ec4-9e960d92b187/fusavolasinugegurolurepog.pdf
    • https://uploads.strikinglycdn.com/files/6d1ad305-9720-4baa-a201-ac81d1fe311d/nilazuradufusuxul.pdf
    • https://uploads.strikinglycdn.com/files/75861322-aff0-4d53-a4f5-580f6712edc8/hp_laserjet_p3015_service_pin.pdf
    • http://zizutanerate.epizy.com/kazavetera.pdf
    • https://uploads.strikinglycdn.com/files/f378a908-b217-4cc0-9232-933dd2abf7b5/62894756664.pdf
    • http://jumivozapiv.rf.gd/best_pathology_textbooks_residents.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_off0000f10a.bin
484310e609ff678bac89fbee8b1de06398dce2d32afb9632a765bd8fef9a3a2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 5580 bytes
font_01_sfnt_off000103fd.bin
91ba0e0875bc593f0ad648ed6917cbff3357ea6a735dcd8c846f26495915f14e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103FD 10332 bytes

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