Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b55abc6bc59bec…

MALICIOUS

PDF

119.8 KB Created: 2021-03-03 22:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 964143cef8dcbe51bef637c18ce07f25 SHA-1: d96b42dfc0441bde6d9c8c190f465244cdaba5b5 SHA-256: f3b55abc6bc59bec41dd4941ab6cb1328a43b76042335b4b2817fe9a1de75c50
186 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this. The embedded URL 'https://midufefew.ru/wix?keyword=roblox+reviz+admin+commands+script+pastebin' further supports the lure of a search result for Roblox-related content, likely to trick users into visiting malicious sites. The ML classifier and ClamAV detection confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://midufefew.ru/wix?keyword=roblox+reviz+admin+commands+script+pastebin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446649/normal_6027228925a40.pdfIn PDF document text
    • https://vigekajabaka.weebly.com/uploads/1/3/4/7/134708837/fesudakuxagik.pdfIn PDF document text
    • http://reactivaperu-2020.com/power_system_analysis_hadi_saadat_3rnp9p7.pdfIn PDF document text
    • https://cdn.sqhk.co/xovinexesun/gjgesMj/monivisomojasimapebu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455208/normal_5feb951be63da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_60126fe1dec5c.pdfIn PDF document text
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/bamitedozasu-dezelenani.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/dthf6jc/prison_escape_map_for_minecraft_pocket_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446162/normal_5ffef56f2a7a7.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/icZDKXe/black_friday_2019_iphone_deals_t_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/jjKhgjh/razerekurirafisutat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409610/normal_6037ae408c929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462073/normal_603619b870fab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baverasoge.epizy.com/7918952276.pdfIn PDF document text
    • http://jizofaludem.epizy.com/tone_chicken_bouillon_cubes_nutritional_information.pdfIn PDF document text
    • http://fumaresaxebikab.epizy.com/17816630748.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_off000198cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198CC 5544 bytes
SHA-256: 4b0bd5533ad23c16b45b620a0ca5c443c29c092d75b62f0a315b59187ffc27a2
font_01_sfnt_off0001aba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABA2 11584 bytes
SHA-256: 853e408e742ee78def930c5939e53b12eed32cafe6a1527cab018824f9eb2c54

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