Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9520d27dfb614e…

MALICIOUS

PDF

70.8 KB Created: 2021-03-14 02:03:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a05745fabe61c01839676dfca06e21f7 SHA-1: f2f056373a07f57816be5088748cf7495d83e4ed SHA-256: 4b9520d27dfb614e3aa2f3cf0a9418b5924d3b361d760bb18baac1db3df3d02b
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, contains text related to a 'masteryconnect bubble sheet test', likely a lure to encourage clicks on the malicious URLs. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/strik?utm_term=masteryconnect+bubble+sheet+test PDF link annotation
    • http://labincom-med.ru/lexmark_ms310d_reset2s155.pdfIn PDF document text
    • http://pifozuvarivin.22web.org/xugoxoxinogewefez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483873/normal_6030467735a29.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382187/normal_5ff3dd0fc1425.pdfIn PDF document text
    • http://b0xberry.online/handsome_bodybuilder_wallpapers1lgh.pdfIn PDF document text
    • http://creamspait.xyz/gevowinozeromuvuravimano3jax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380219/normal_604348f6ac70a.pdfIn PDF document text
    • https://jibunomo.weebly.com/uploads/1/3/5/3/135348462/kepimadogiguv_zobugivavetilaw_sufewug_tozimaluselex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482002/normal_5fcad6a24df4a.pdfIn PDF document text
    • http://com-signto5.xyz/741835589010frzi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370068/normal_600980aaedb3e.pdfIn PDF document text
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/3a89699.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://keguwaburafokul.epizy.com/86085190850.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_128f2717b6e8421a8151fcfcc01a1472.pdf?index=trueIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_5c95fc9c67cb4753aa150bbddc7c923f.pdf?index=trueIn PDF document text
    • http://medelomozukomav.epizy.com/12961127739.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_d07c1567de8f431293451de1488d85c4.pdf?index=trueIn PDF document text
    • http://wabupotobexuxu.epizy.com/blue_cross_of_florida_prior_authorization_form.pdfIn PDF document text
    • http://ruxusanufip.rf.gd/81661870383.pdfIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_c00d267eb6e54d46b641052b359b31ae.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_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 5136 bytes
SHA-256: f913851ab8661287849889b3c2a683b7cc6295dbb9cc92f56e6bcb2859abb5e0
font_01_sfnt_off0000e971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE971 10940 bytes
SHA-256: 7f9f8c131ecd95a62e5bbdf43d06b5e2d1c0afca8c056aa8855d399be0664349

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