Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a8960c558c9ffd…

MALICIOUS

PDF

95.2 KB Created: 2021-05-21 04:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: cfc1c98e46301279c3c72c8d51e91b50 SHA-1: 2d804aa8061129627bf504d934710696ff2194da SHA-256: 64a8960c558c9ffd4bc06d64411412213cb68990abd5a7144722f1003561270d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The primary malicious URL identified is 'https://jacksth.ru/strik?utm_term=intercultural+communication+in+contexts+6th+edition+free+download', which is likely part of a phishing or malware distribution scheme. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/strik?utm_term=intercultural+communication+in+contexts+6th+edition+free+download PDF link annotation
    • https://warubeduzubam.weebly.com/uploads/1/3/5/2/135298611/muzomi-nifesib-gakowuragovexej-jetekuvesidi.pdfIn PDF document text
    • https://dorugemapakew.weebly.com/uploads/1/3/4/6/134680888/pivewidolutewofer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409997/normal_601b902694137.pdfIn PDF document text
    • https://lavafijaxeb.weebly.com/uploads/1/3/0/7/130740432/xamapifubapapat-gimoniwunusebi-vutef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479446/normal_6044d529ac3fd.pdfIn PDF document text
    • https://vofesoxofibebup.weebly.com/uploads/1/3/4/9/134900141/25924.pdfIn PDF document text
    • https://suxutusebosogu.weebly.com/uploads/1/3/1/3/131379987/3854334.pdfIn PDF document text
    • https://befomunuduti.weebly.com/uploads/1/3/1/1/131164266/70ad47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476590/normal_6038755c95bc9.pdfIn PDF document text
    • https://wubigunes.weebly.com/uploads/1/3/4/5/134507070/gifofomefimes.pdfIn PDF document text
    • https://pozefixinez.weebly.com/uploads/1/3/1/4/131454190/1659715.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/180bd247-5600-4802-a407-189793ecf87b/fifezal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb4bdb9c-be2c-4dc1-a2e4-6a880e1ae764/22977152551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f0b71f-004f-4c61-a13b-43753fe16b57/trigonometry_problems_with_solutions_for_class_11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8adbb4f3-885e-4e43-80bc-297f31308ffd/71592565222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a83d4380-f6c2-4e9c-b18f-8ac153d9c507/computer_systems_a_programmers_perspective_3rd_solution.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/sularufis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d42b7b-9fb5-45f6-830a-969454563294/how_to_calculate_triangle_area_in_square_feet_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27f74d46-dd63-419f-a765-fa80ee160d7d/rolomevejodakukedujewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cff01d6-99df-45c6-9f13-3765b1e5013f/88264412100.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/bivefawuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c586617-ddd8-4879-ae62-ce3f2a24b9de/how_to_write_an_introduction_and_conclusion_for_a_compare_and_contrast_essay.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/runef.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_off00013735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13735 5512 bytes
SHA-256: d304271d795773141538f4b5e165a8a7e9acd720ad3eab7ce9e98c2b1dfa211e
font_01_sfnt_off000149db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149DB 10744 bytes
SHA-256: 4ad1249ddd6b837ecb2cee954b3fbf6907c8e966cb7830ba19ff79d15c035ea6

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