Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6dc9905275e28d…

MALICIOUS

PDF

84.6 KB Created: 2021-03-06 14:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 364aad75ec175ca9edbf43fa809cac11 SHA-1: 52c972786a34ad137c4774ed5672709c0c096320 SHA-256: cd6dc9905275e28d403fcd90056fcd2ee191908611466b162e4c773f63c33e78
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic of using many links on disposable hosting, likely to obscure the true malicious destination. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to redirect the user to a malicious site for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://lozipotod.ru/123?utm_term=answer+key+dna+base+pairing+worksheet+answer+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492529/normal_601efa4844f8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463287/normal_601bb4b0435c2.pdfIn PDF document text
    • https://cdn.sqhk.co/vefemonuru/d3hfzgd/sonofusakabek.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/65605224204.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/55456203056.pdfIn PDF document text
    • http://wajazenizur.mywebcommunity.org/woloperuki.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/bjjNYhg/dojiwufupedifuzamarilipu.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/miller_thunderbolt_ac_dc_welder_parts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445119/normal_5fe05f963a228.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/2B1Q4hW/lifasovorubitu.pdfIn PDF document text
    • http://begimewabifax.getenjoyment.net/bubofomotubokixiriliwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412159/normal_5feef8d4ec0ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_6950e5ba2ab94108a5df363f08db01ed.pdf?index=trueIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_1f6f9fecb6ec48ea95fcafd47f026b07.pdf?index=trueIn PDF document text
    • http://mepitar.atwebpages.com/20986296258.pdfIn PDF document text
    • http://lojokedasu.rf.gd/balkeshwar_iti_form.pdfIn PDF document text
    • http://bukumetaboxalo.epizy.com/ib_history_extended_essay_guide.pdfIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_f03a6557ae514ed0ac6974335032265e.pdf?index=trueIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/52189041816.pdfIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_0fd0d3e38f7446608a244cef31467b86.pdf?index=trueIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_5fd8b1e343754bfda79f42739f9c569f.pdf?index=trueIn PDF document text
    • http://kapirexazi.onlinewebshop.net/the_power_of_positive_thinking_book_download.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_off00010d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 5576 bytes
SHA-256: 86a39f5f1e459b49a629be5f092df118cbeba025e7aef5dd3da747ddea1e065a
font_01_sfnt_off00012048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 10704 bytes
SHA-256: ee2c655d8bc19211e176a48570731c6dd0afb7198dc2e03e13cc53326564d28d

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