Malicious PDF — malware analysis report

Static analysis result for SHA-256 63eee3f8f2b869d3…

MALICIOUS

PDF

78.4 KB Created: 2021-03-23 22:03:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: de27b32ad23e65f32cfc3ea3f49e436d SHA-1: 2f636a316380d75be0f9f5a4ff590b15cf82bfde SHA-256: 63eee3f8f2b869d340702dbf3e5a399a47b349443bcf1a7f305a69862a2fd96d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious websites. The primary malicious URL identified is https://xezojetit.ru/strik. The document body appears to be corrupted or obfuscated, preventing analysis of its specific content.

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://xezojetit.ru/strik?utm_term=william+shakespeare+sonnet+73+interpretation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405953/normal_6054bbd85bfb0.pdfIn PDF document text
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/bulefepejoretafani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_6046355c92257.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413125/normal_5fc7f17a8d5f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470685/normal_602edee40eaf0.pdfIn PDF document text
    • https://mewasopaligesar.weebly.com/uploads/1/3/1/4/131454012/8056520.pdfIn PDF document text
    • https://palivifu.weebly.com/uploads/1/3/3/9/133986562/89655704eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465277/normal_5fc9fbe89897c.pdfIn PDF document text
    • https://cdn.sqhk.co/naludibeg/fjdgijg/300_east_front_street_traverse_city_mi.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvuwoki/hjgiSjj/bixiwewipuwisotimajo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_1093810895104061852b46dbc479eef7.pdf?index=trueIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_870f91b808b2479b9002a123adec63b6.pdf?index=trueIn PDF document text
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_e565b707034a4a47b5a15bbb4195ca38.pdf?index=trueIn PDF document text
    • https://07f52280-50dc-49c2-beec-a2e30bf849d0.filesusr.com/ugd/7b8f90_7986b86d4a9e4c85ae40f94ab8020db0.pdf?index=trueIn PDF document text
    • https://1639490a-f715-481e-9fb1-af38d332269b.filesusr.com/ugd/a59130_5480c4c63cdc4b2fb5f38b51609f6322.pdf?index=trueIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_cc29f5aa841446b59e166924c85b4803.pdf?index=trueIn PDF document text
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_4ff422d947b34d79863d7309706882fd.pdf?index=trueIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_f1ff1424dcda49698e1523150c0a6e86.pdf?index=trueIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_81eb977cc25f4a08bc6c307234a84a6f.pdf?index=trueIn 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_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 5380 bytes
SHA-256: 01fc0662afedf339e0106f76da9f5287a229380a54fa741c113880ecec1c8fb5
font_01_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 10976 bytes
SHA-256: 13a5b0764fe0b5d658d30b8b1de06de557e2f2e928a7afb47220e0c811e21b8b