Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b100f0619a5237f…

MALICIOUS

PDF

76.0 KB Created: 2021-03-06 06:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1461ba89d63a099df8a85296f1b49d00 SHA-1: d7eb37a78b2695af32a2a745792d82c5e2f6097b SHA-256: 6b100f0619a5237f09ada8666cb10b9d0481456ec2b2e1689066d78fbd0fc35d
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded URLs likely lead to malicious content or phishing pages, and the document body, though heavily obfuscated, contains references to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=how+to+take+apart+a+taurus+pt-22 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448724/normal_60148125e37ae.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/TRhiBt3/free_business_plan_template_for_trucking_company.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/0fjjxgi/mci_airport_map.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikuzi/gDbibic/93832018199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501632/normal_6042de5ec718f.pdfIn PDF document text
    • https://cdn.sqhk.co/wafasojudo/tjm1Cia/sticker_maker_machine_cricut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482207/normal_6032aa5219371.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389585/normal_5fdc0b3860c3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391898/normal_5fe6db763c36e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449205/normal_600320002dac3.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/how_to_ground_yourself_dissociation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393016/normal_5ffe99132bffc.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/49702771151.pdfIn PDF document text
    • http://penageli.getenjoyment.net/can_you_use_a_universal_remote_on_a_hisense_smart_tv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fepetixapokurob.myartsonline.com/4104595069.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/schwinn_recumbent_bike_fix.pdfIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_6f5b4ac3d9e2410ba99183832fbc63df.pdf?index=trueIn PDF document text
    • https://d9226533-59f4-4737-ae77-cfa9cdee5378.filesusr.com/ugd/d7c203_078ac29e8b334df59f73b0cc3de0e633.pdf?index=trueIn PDF document text
    • http://fazobelo.onlinewebshop.net/sakewelubiposinepe.pdfIn PDF document text
    • http://pogetowem.onlinewebshop.net/20309318702.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_off0000ea2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 5064 bytes
SHA-256: 5babbeb94659f6bb334bf7c9c18faf7aa2a1aa2fc9ee3fcfaf960eee6d899f00
font_01_sfnt_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 10984 bytes
SHA-256: a2a7d54d81bcf9fbd40b81ef4983dc87c751f38194578237d6e736ece9e172cb