Malicious PDF — malware analysis report

Static analysis result for SHA-256 413d3c0dccb964f4…

MALICIOUS

PDF

80.4 KB Created: 2021-03-24 06:03:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 47f5aff69ca3089ccb5b5167bc810766 SHA-1: bafa21c4c56b299475cf32f31ca9472483cab86f SHA-256: 413d3c0dccb964f4f879d69b082358b22d5f3159d725f49df288b9beb5d3e2e5
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://dafemum.ru/wix?keyword=indianapolis+city+directory+1967'. The ML classifier also flagged the PDF with high confidence. While the document body is heavily obfuscated, the presence of these malicious links suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=indianapolis+city+directory+1967 In PDF document text
    • http://gufezonasu.iblogger.org/surubiderudez.pdfIn PDF document text
    • https://cdn.sqhk.co/tavanaru/HEicigC/palenib.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/hghcQgd/monument_valley_weather_september.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501204/normal_5fc5b3bceb850.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/9IrY8hf/war_of_dragons_2016_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/soxesemu/higcjeh/39524458867.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501027/normal_5fddd01c0fc26.pdfIn PDF document text
    • http://jushq.club/83733366038f7dzx.pdfIn PDF document text
    • http://francobusiness.com/powerpoint_puzzle_template_pptmylje.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/iihhef5/96373328558.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/89759553811.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_2b52e1dd50c544d895815e060576bdc8.pdf?index=trueIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_8ab491cc3a9340c2aff7f1615ab46cbb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/nakopujolovazuruwis.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/is_the_island_of_dr_moreau_on_netflix.pdfIn PDF document text
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_cfa63bc8e2be441db58241eb51f61c74.pdf?index=trueIn PDF document text
    • http://nazifaba.rf.gd/ashland_ohio_weather_report.pdfIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_72e5902f3fb24720b205acf71e26498d.pdf?index=trueIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_7bbdf4998284496188cc91d10bae0e02.pdf?index=trueIn PDF document text
    • http://wuwomuwudawim.epizy.com/xexikekuvebeg.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_off0000fd86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD86 5548 bytes
SHA-256: fa7607697dababa791dae3ae279fc1548fc4e13cc5b3efe625220a2f7afb1315
font_01_sfnt_off00011080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11080 10432 bytes
SHA-256: c8d93df89ccb4e908a1d9bcc7836ed731332a1f4b12aacd88ae9762146f1630f

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