Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d1bf8dea0c530e…

MALICIOUS

PDF

82.2 KB Created: 2021-04-22 10:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f1b3a8e4a401fb6ab9171f222905944 SHA-1: d076706962440cc7f61eef1f6c0b018af66aaa1b SHA-256: a1d1bf8dea0c530ecf415250100f70c29fe8a9d93ee1bde8d56c1d0428428092
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation and potentially distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=a+thousand+and+one+nights+kid+stories
    • https://fiverepibimasi.weebly.com/uploads/1/3/4/8/134893498/6581514.pdf
    • https://bujapuvewujik.weebly.com/uploads/1/3/4/7/134702992/e1d7c278e430.pdf
    • https://cdn.sqhk.co/tajudozizif/a4ghRZB/30541949932.pdf
    • https://tenipimip.weebly.com/uploads/1/3/4/0/134042327/7dd820d2e0d.pdf
    • https://cdn-cms.f-static.net/uploads/4404122/normal_60674ad41f149.pdf
    • http://fosavaxenu.mypressonline.com/jagasunegokexemi.pdf
    • https://simazilojimi.weebly.com/uploads/1/3/5/3/135345327/822d8.pdf
    • https://ranekiwoj.weebly.com/uploads/1/3/0/8/130814960/wajokiloten.pdf
    • https://gisetokitalakak.weebly.com/uploads/1/3/4/6/134600310/644848.pdf
    • https://cdn.sqhk.co/mivesumor/JgjHVib/bowavugiwigeresolu.pdf
    • https://vomuzubedabop.weebly.com/uploads/1/3/0/9/130969103/godafob.pdf
    • https://cdn.sqhk.co/xubupigegi/xhdhjji/sonic_the_hedgehog_coloring_pages_online.pdf
    • http://guzexesuge.mypressonline.com/37018004830.pdf
    • https://cdn.sqhk.co/suxujaba/73hi2ig/lasijaruximolirapezigalo.pdf
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/81656b792c.pdf
    • https://cdn-cms.f-static.net/uploads/4418381/normal_6047a19a10396.pdf
    • https://cdn.sqhk.co/kogoruzojif/jJmwh3T/bumubitarifixeborar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sopexalibip.onlinewebshop.net/hotel_budgeting_and_forecasting.pdf
    • https://uploads.strikinglycdn.com/files/9593bcd6-bbb6-4b78-aaaf-fb04aa0030a7/conference_of_the_birds_ransom_riggs_review.pdf
    • https://uploads.strikinglycdn.com/files/d61da708-d15c-4fb0-a58d-4189277716eb/caracteristicas_de_los_personajes_de_la_obra_aves_sin_nido.pdf
    • http://wiloradakuno.onlinewebshop.net/common_idioms_for_ielts_speaking.pdf
    • https://uploads.strikinglycdn.com/files/25ee746d-d160-4d10-981b-09623ea8efeb/fesigopilozaxe.pdf
    • http://vowojuxibaxo.myartsonline.com/xaguwal.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_off000102e7.bin
e7ccbe426595b738f9290ca290a4036eda5f8b61983e684b89091eb13eaf8bfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 5108 bytes
font_01_sfnt_off0001143e.bin
7b2713856c46bf58414daec4685354d217d65f8144541b41df0fb2838dda715f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1143E 11740 bytes

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