Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd033f71df63c541…

MALICIOUS

PDF

75.6 KB Created: 2021-05-03 23:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 394a2bea8d699a28a3487388c123e083 SHA-1: 96e99252603f494aa594423830b53f2cd1634990 SHA-256: cd033f71df63c54135a7258220ae8bb1cd8d12520ccaa347447c73ceb9ad3c2c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=is+prodigy+math+safe PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482002/normal_5fe6a428b2132.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380382/normal_604c9bd636531.pdfIn PDF document text
    • http://xunajoza.22web.org/fimovasulaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_604b5342993ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479236/normal_604cbf7111421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_600d6c2100077.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373986/normal_5fce17fde63f9.pdfIn PDF document text
    • http://rabokomokot.iblogger.org/lofezuxexal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409813/normal_603c1d11ab9ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413013/normal_6003bdf7c3a72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370053/normal_606cd57d13cdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530846/normal_603896a5f008e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/793fe902-4407-48f1-bec1-b2c7f7905759/sierra_load_data_308_155_tmk.pdfIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_8e4e65bc4eb74197af30b4ccbcc2819d.pdf?index=trueIn PDF document text
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_b0f11912928348658cf1a0ed5a50326a.pdf?index=trueIn PDF document text
    • http://gefuxexo.epizy.com/witudepam.pdfIn PDF document text
    • https://c2245d91-bd3f-4016-bed3-1da34bcfd793.filesusr.com/ugd/9a652e_51e151417feb4bfaaf7ed107592306ae.pdf?index=trueIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_6f58d8651a4d461daa1ae423ec63d226.pdf?index=trueIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_6ea18aa78bf84b58adb4dbdd455f69f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a267aa11-a679-43cb-8147-502efcfe0743/pod_xt_live_vs_pod_x3_live.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc7dae5-9095-478f-be2e-2dfbf0fc0249/gewazutokinasadizixekigo.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_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 5464 bytes
SHA-256: 463ea1b86b9023b96300cd59204425c5a396003e281337a651e4392f17cb930a
font_01_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 10304 bytes
SHA-256: f97d6d55c45fd14f4d8005428550f0f7cbd0b3d5780f7f7570f329a546a4e615