Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b3b95d3e00bb8d…

MALICIOUS

PDF

77.8 KB Created: 2021-04-16 23:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2bfbc42210c9e6ab0b9236a36ab7026 SHA-1: 247c47c6b233fc459710d5cca58ab5f3a1e22e44 SHA-256: 43b3b95d3e00bb8df9d7d00862551f2091fd48f72c73b8a5065b51a38651e04b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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://seumenha.ru/strik?utm_term=husqvarna+435+chainsaw+chain+file+size
    • https://xiluxobafuju.weebly.com/uploads/1/3/5/3/135323992/37f22b4d6886a.pdf
    • https://cdn-cms.f-static.net/uploads/4378175/normal_6041d81e498ad.pdf
    • https://static.s123-cdn-static.com/uploads/4419650/normal_5fc8157724794.pdf
    • https://cdn-cms.f-static.net/uploads/4366980/normal_6019d99a0622f.pdf
    • https://romidanunopupef.weebly.com/uploads/1/3/1/1/131163616/bebeju.pdf
    • https://xifekuvazunavel.weebly.com/uploads/1/3/4/7/134748582/7750056.pdf
    • https://cdn-cms.f-static.net/uploads/4388620/normal_605d3725ad9cc.pdf
    • https://sepolekabu.weebly.com/uploads/1/3/1/6/131606201/bagowevetenunusowod.pdf
    • https://kezugefoluvero.weebly.com/uploads/1/3/1/8/131856244/2377822.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_f786197224a64e9684e15c64d290e2c0.pdf?index=true
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_d1116eab43b5428eb27eebb8236eb1cf.pdf?index=true
    • http://vixoboguwexalo.rf.gd/lepugilalibiv.pdf
    • https://3f7ff619-1e23-491c-a925-ddda4d79b49c.filesusr.com/ugd/79c22a_bec7b5df935648aeb23622782e9fabb7.pdf?index=true
    • http://kunegozaribop.epizy.com/soundlogic_xt_touchlight_manual.pdf
    • https://uploads.strikinglycdn.com/files/1c2e9d74-ca70-41d9-91ba-6fe489cc5ed6/davinci_resolve_15_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/91b23221-1011-48dd-8e0a-1134898c219c/create_json_format_in_c.pdf
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_a667e0ccf3d143a6a6f8ea05d5abb64f.pdf?index=true
    • http://lojiwifi.epizy.com/navy_seals_tv_show_new_season.pdf
    • http://rinikebamujigiz.rf.gd/business_intelligence_case_studies.pdf
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_80000826141940da9355506274ba97e3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5dc49ac3-fecd-4994-85b9-d7559dfccc45/how_to_use_homage_microwave_oven.pdf
    • https://uploads.strikinglycdn.com/files/ec8a4b67-1af4-4dce-b3ce-d1f2a769921d/glencoe_science_biology_answer_key.pdf
    • http://kutadomirezo.rf.gd/pudoforafazu.pdf
    • http://somaxowirotiko.rf.gd/bizorigufoluzebi.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_off0000f1b0.bin
cc9456f3e3c25233eb14251e376d11d5fb03d6ce27f0d98749aac0846305efa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 5636 bytes
font_01_sfnt_off00010509.bin
db453fb6480df1c399d8611bd500df4f5706ffe1910f63cc67e93c5f4f20b8c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 10712 bytes

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