Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24188b84cf7aa58…

MALICIOUS

PDF

86.9 KB Created: 2021-03-13 20:23:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a73a6bb8e2b5bbf69bf60b4a2749010a SHA-1: ef90d96b8a1adc9e4bd1b0c777156e4cc4caf64d SHA-256: b24188b84cf7aa584618759e9eb18f3350309790abb66321627f528224e941d5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'link farm' designed to direct users to other PDFs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/123?utm_term=microsoft+surface+ergonomic+keyboard+user+manual
    • http://chambreapp.xyz/which_coin_paradox_calls_for_the_ability_to_assesspbk7h.pdf
    • https://cdn-cms.f-static.net/uploads/4367903/normal_601e9696bf6ce.pdf
    • http://reduslim-italia.website/igo_navigation_micro_sd_cardq9cta.pdf
    • http://kobivoweder.mypressonline.com/83255189376.pdf
    • https://cdn-cms.f-static.net/uploads/4501484/normal_60110da42c501.pdf
    • http://persequenteamsohbet.com/xidosunegulowudisepi5t74j.pdf
    • http://bixaxivajujojar.mypressonline.com/what_are_the_missing_numbers_in_the_sequence_4.pdf
    • https://cdn-cms.f-static.net/uploads/4408864/normal_5fd153bd4007b.pdf
    • http://findssldz.xyz/yoga_exercises_for_lower_back_pain_jen_hilmanq4m59.pdf
    • https://static.s123-cdn-static.com/uploads/4467586/normal_5fcd9c8a92b33.pdf
    • https://cdn-cms.f-static.net/uploads/4372753/normal_6046458b41654.pdf
    • https://static.s123-cdn-static.com/uploads/4471092/normal_5fc5e46b8c181.pdf
    • https://static.s123-cdn-static.com/uploads/4446636/normal_5ff78dce0de89.pdf
    • https://cdn-cms.f-static.net/uploads/4379971/normal_6028668d058fb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_6f4e18782a914596be86436157a53a4b.pdf?index=true
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_3b0347ff9ef244d3ac9806f102480303.pdf?index=true
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_a045714197054c6cab6937cde3d5f89c.pdf?index=true
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_1a4bff6fd3034264b97dbc70b7afa4bc.pdf?index=true
    • https://56a79910-2d97-40e4-a1df-bca3b17021d7.filesusr.com/ugd/2721fc_5150fbf6662f4ac085e142f65af3482a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/410a0ea2-1a6f-4d17-8c20-37244ad3d759/hoover_max_extract_77_multi-surface_pro_fh50240_reviews.pdf
    • https://uploads.strikinglycdn.com/files/e1d10fd2-2cbc-4210-a777-b11f9e042f81/gospel_centered_life_free.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_off0001165a.bin
b030aa0a5174de3940f7f397d017858e62c79263c320b9b485ef8a99e913b083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1165A 5652 bytes
font_01_sfnt_off00012997.bin
c4abf8144a4b64040bda949f5f67105d47f8191e0243d97b41dc781b29b785e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12997 10708 bytes

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