Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb71ed457c925c9…

MALICIOUS

PDF

77.5 KB Created: 2021-05-21 09:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ea0da94066d66b21ac0a0af108f2544 SHA-1: e428f4047cfb9364b077080de9ef2e6f774baa21 SHA-256: 2fb71ed457c925c9490790ad49f407017ab1b10ac69743959073181809d8c72f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, a technique often used for SEO poisoning or phishing, with the primary malicious URL being https://midufefew.ru/strik. The file's structure and embedded links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/strik?utm_term=%25D0%25BF%25D0%25BE%25D0%25BF%25D1%2583%25D0%25BB%25D1%258F%25D1%2580%25D0%25BD%25D1%258B%25D0%25B5+%25D0%25BF%25D0%25B5%25D1%2581%25D0%25BD%25D0%25B8+%25D0%25BA%25D0%25B0%25D1%2581%25D0%25BF%25D0%25B8%25D0%25B9%25D1%2581%25D0%25BA%25D0%25B8%25D0%25B9+%25D0%25B3%25D1%2580%25D1%2583%25D0%25B7+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C
    • https://static.s123-cdn-static.com/uploads/4376602/normal_5ff381f728460.pdf
    • https://cdn-cms.f-static.net/uploads/4464710/normal_600e77cdad3d0.pdf
    • https://static.s123-cdn-static.com/uploads/4482847/normal_5feb443daac29.pdf
    • https://cdn-cms.f-static.net/uploads/4450138/normal_605824df191f5.pdf
    • https://cdn-cms.f-static.net/uploads/4424662/normal_600a64f979bb9.pdf
    • https://cdn-cms.f-static.net/uploads/4490266/normal_603eff43a50ab.pdf
    • https://xoxudepibedewem.weebly.com/uploads/1/3/5/3/135317482/segimasubagunu.pdf
    • https://cdn-cms.f-static.net/uploads/4379837/normal_605003f87445b.pdf
    • https://cdn-cms.f-static.net/uploads/4501380/normal_601d7e906030e.pdf
    • https://cdn-cms.f-static.net/uploads/4478687/normal_604ee7c25e177.pdf
    • https://zejuvuvegodefi.weebly.com/uploads/1/3/1/4/131453892/gupiziwatugoke.pdf
    • https://static.s123-cdn-static.com/uploads/4409255/normal_5fcc1ab70ef77.pdf
    • https://cdn-cms.f-static.net/uploads/4489583/normal_606dc5b741cc1.pdf
    • https://duwatazajopi.weebly.com/uploads/1/3/4/2/134235013/cb9f29f77f9471.pdf
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/tifudesofero.pdf
    • https://cdn-cms.f-static.net/uploads/4371267/normal_6015303d790a0.pdf
    • https://static.s123-cdn-static.com/uploads/4486984/normal_6008ebd4d93b3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/40cf85b5-5e5a-49f9-87ea-8b5b36e3fd9b/murray_24_inch_riding_mower.pdf
    • https://uploads.strikinglycdn.com/files/583226bb-a980-47cf-8238-c6aa5bbd18b8/68125470056.pdf
    • https://uploads.strikinglycdn.com/files/85299bb3-aaca-46ce-ba33-40643af0f2e0/find_the_missing_value_to_the_nearest_hundredth._cos______9_20.pdf
    • https://uploads.strikinglycdn.com/files/4cc1cf04-0606-49a6-8306-f894d65df27e/41933000635.pdf
    • https://uploads.strikinglycdn.com/files/ef695cf2-2376-4807-a310-84c698764f76/razer_blackwidow_ultimate_2014_keys_not_working.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e101.bin
84b6560e8e2669c3f9dc3c8732ccb5a69314e4841cb6af78fdff91583d8e0b2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 6012 bytes
font_01_sfnt_off0000f4be.bin
9d422f4ceeb8dcc19e860fc0da1521ee6ae5d6f38ae5b71d93843a13496cc5e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BE 15764 bytes

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