Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4f0450f6e4d032…

MALICIOUS

PDF

79.8 KB Created: 2021-03-17 15:16:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c2daf3c5df4236e3f4bb141ade92e10 SHA-1: 5b02ac5377612cde63ecbe2656e59a0da30f11bc SHA-256: 4a4f0450f6e4d0321905f32d0b7b78299522e71f400d72b116136689a2372fa9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, flagged as a "PDF_SEO_LINK_FARM", suggesting an attempt to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of many external URLs and the heuristic firings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bologen.ru/award?keyword=gym+workout+plan+for+beginners+female+pdf
    • https://pufokebisuniga.weebly.com/uploads/1/3/5/3/135324869/levuk.pdf
    • http://foluxokifoni.22web.org/cloudy_sky_images.pdf
    • https://cdn-cms.f-static.net/uploads/4454438/normal_60152092c4950.pdf
    • https://static.s123-cdn-static.com/uploads/4376879/normal_5ffb0592f09d4.pdf
    • https://tivositazevuzin.weebly.com/uploads/1/3/5/3/135349871/zozabotog_sukobonelaful_xakusinog_konova.pdf
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/xisobubukamobox_kojosek_tazojalikuzovi.pdf
    • https://migawireradafus.weebly.com/uploads/1/3/2/6/132695569/3212747.pdf
    • https://pedidifapa.weebly.com/uploads/1/3/0/8/130874671/4508705.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_041d9a5e2f8f4757a6f32be50062a2fa.pdf?index=true
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_2ddae4cc082243f7a013bf552712100f.pdf?index=true
    • http://fedubumisuvek.epizy.com/47914737682.pdf
    • http://bakenexiradofo.epizy.com/tudelajuxorogunexawak.pdf
    • https://uploads.strikinglycdn.com/files/d470b359-b1a7-43ce-8788-605eaab5aae3/63045106830.pdf
    • https://0e8f88b9-656e-4b05-9cd8-8bd477f85547.filesusr.com/ugd/95b9ea_42f0a4d4a32f4037b1cc6364d7d39dbb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/39237243-8b45-4865-96ad-ff602253d749/how_to_deal_with_public_speaking_anxiety.pdf
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_efed787b33c24bf793536a78db74898f.pdf?index=true
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_7244a2e507754c81b33618b65772006e.pdf?index=true
    • http://tedivepi.epizy.com/paris_boarding_pass_invitation_template.pdf
    • http://kapetevik.epizy.com/zepurawurej.pdf
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_8bad2b0ac9f6497aa1158c9d192078ec.pdf?index=true
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_d1466f49da4e493fb41e9364d3053597.pdf?index=true
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_dc403273c3224984b72f0e971687d338.pdf?index=true
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_77a697690e284272a2ca69c5f2422be7.pdf?index=true
    • 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_off0000f83b.bin
84f57e368824fb1cb0f7221fd702cbb1c8dd5d586a7273a5fe6fcc3567505e99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF83B 5788 bytes
font_01_sfnt_off00010bf6.bin
8cc5944d1e0ff26b69cb4298c92198e6f0e98867207380b94db4df27799d0fd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF6 11184 bytes

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