Malicious PDF — malware analysis report

Static analysis result for SHA-256 17babb40f90ab30b…

MALICIOUS

PDF

85.6 KB Created: 2021-04-11 00:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 369af3b29c3f97a764808e5a52878e70 SHA-1: 6ed0f676d0bfbf29ad3bf5c2ff1747e53e637958 SHA-256: 17babb40f90ab30b708b4366d7fffe3ea17e15dee3455918ce1f73e24d1d6ccb
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. One of the extracted URLs, 'https://jumiwimov.ru/strik?utm_term=definition+effectual+call', is likely part of the attack chain. No scripts were extracted, but the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/strik?utm_term=definition+effectual+call PDF link annotation
    • http://telgrm.site/kedufujaxoluzdyxab.pdfIn PDF document text
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/sisovuxox.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/gEhf4ib/vipegitawirikufizo.pdfIn PDF document text
    • https://cdn.sqhk.co/lutidofele/hbhjgiP/save_the_girl_level_28.pdfIn PDF document text
    • http://zeridizumof.iblogger.org/juvosusilukisab.pdfIn PDF document text
    • https://dukalafaziwemum.weebly.com/uploads/1/3/4/7/134772398/1750585.pdfIn PDF document text
    • https://tixemuxizufog.weebly.com/uploads/1/3/4/7/134746981/73fef5a.pdfIn PDF document text
    • http://businesslinecenter.com/real_estate_exam_cheat_sheet6wan0.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/9xmYQ3I/64130724918.pdfIn PDF document text
    • https://cdn.sqhk.co/wetiniwem/gghidGo/redomofunex.pdfIn PDF document text
    • https://nemusadepupozug.weebly.com/uploads/1/3/1/4/131453027/83014f7e18e13.pdfIn PDF document text
    • http://on-arenas.com/1001908191kgh4b.pdfIn PDF document text
    • https://cdn.sqhk.co/bivotiboma/Q8Wjfdd/83118486804.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://piwufamudadavo.rf.gd/understanding_pathophysiology_canadian_edition.pdfIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_f33dbb51e9104ff598dfbde3fa9352d3.pdf?index=trueIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_76c7046007e5434a876d6010c6ac60ef.pdf?index=trueIn PDF document text
    • http://roxegubipav.epizy.com/bow_hunting_for_beginners.pdfIn PDF document text
    • http://xibubew.epizy.com/57268324891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f84c76dd-e2f4-4b1e-bf1b-4c99e44b3ec9/19318680452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/767d93b4-6035-4659-bda0-1f6287e2c050/how_to_file_illinois_sales_tax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e87bd220-3b3b-45d9-b217-55cedd05b447/61458808081.pdfIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_72134e0594d8479e96b6e885ffc41f15.pdf?index=trueIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_77de0fce91f6487088d5e99a75b9120b.pdf?index=trueIn PDF document text
    • http://popadugabi.rf.gd/kumevavupanut.pdfIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_32604175392f48388ca7d534ca22fef2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106ED 4480 bytes
SHA-256: 1ea48c3f4e7312fff3a810647029e2097f7f188998f77c540d65577a5a8deab1
font_01_sfnt_off00011642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11642 10376 bytes
SHA-256: 087614b58aaa8a40d6a17fd8493c37271667d58f3179b6b457923a6e26fcaf06
font_02_sfnt_off0001398a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398A 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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