Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c169c67e1ede85…

MALICIOUS

PDF

85.8 KB Created: 2021-04-06 01:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 93597009043a7b892ab51d0b34aac50d SHA-1: 158d7b9aa23e1fa33b36c651ac7d4d2f28738084 SHA-256: 93c169c67e1ede857c92f92636c504e225666d474cc7c333b5a486607a089357
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating it functions as a link farm. The primary malicious URL identified is 'https://seumenha.ru/strik?utm_term=the+shape+of+things+to+come+idiom+meaning', which is likely used to distribute further malware or phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/strik?utm_term=the+shape+of+things+to+come+idiom+meaning PDF link annotation
    • https://cdn.sqhk.co/nudadubuju/ggiBOk4/bridal_wedding_gown_rental.pdfIn PDF document text
    • https://wiwajefe.weebly.com/uploads/1/3/4/6/134676348/66709.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/hahd3mB/lidavaxo.pdfIn PDF document text
    • https://cdn.sqhk.co/jukelifawap/VlWvMge/beats_x_not_connecting_to_android.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwuzuwix/cZElm1g/defefagokapajozomufenow.pdfIn PDF document text
    • https://cdn.sqhk.co/dusivubeleza/gjhjegc/us_military_conflicts_in_the_90s.pdfIn PDF document text
    • https://tuduzijusesuzi.weebly.com/uploads/1/3/1/4/131406801/2784956.pdfIn PDF document text
    • https://gixobuwek.weebly.com/uploads/1/3/2/8/132815317/3221077.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/3yuS6ia/asbestos_cement_sheet_content.pdfIn PDF document text
    • https://cdn.sqhk.co/kotoweraga/hcgiT1h/crash_arena_turbo_stars_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/iiegcjh/26359964618.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/bREhhia/xigunusek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/beetalk_for_android_2._3._5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0083015c-e28d-49a2-ba62-e98283bf11e6/my_family_and_other_animals_1987_tv_series.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d039383-0569-49cf-82d1-3d0185ca14e9/harbor_breeze_ceiling_fan_remote_receiver_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/11599049883.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/nifegivexugebefeg.pdfIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_370c647815ed4d998508e1251e670fb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wavunot/ruger_10_22_mannlicher_disassembly.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/velixaxunanesapuzobeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/942680af-60c9-466a-a6b8-4f91cc54d22a/how_much_does_a_motion_graphics_designer_make.pdfIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_a11222a66a004de6bbfa09affde0af9c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e059c5b-12e0-41ae-a56c-8ac1f6153ff9/46468856632.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AD 5388 bytes
SHA-256: b21b672585867fb4f53eb87e83b300f57a1dd9b0dab3d762252c515362950a88
font_01_sfnt_off000122e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E1 11560 bytes
SHA-256: e7f67bb44d02ea198bd441a634d1731ae0efdd31e90a4b4a6ae294b84516e351