Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26771abc5d28cd2…

MALICIOUS

PDF

76.0 KB Created: 2021-04-15 19:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 59282c2b69c11136481caf920c21bf76 SHA-1: d7adc47e201a53f3d63da8f6c76e0e3bc680805f SHA-256: a26771abc5d28cd2534b2e415454635d8916b201cf1173e7d546489c3c1670fa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://soxebez.ru/strik?utm_term=royal+1216x+paper+shredder+reset PDF link annotation
    • http://nesebonuvobeju.getenjoyment.net/what_are_the_cube_numbers_from_1_to_1000.pdfIn PDF document text
    • https://cdn.sqhk.co/dosovejozeb/gCKTBgp/body_shop_at_home_area_manager_salary_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459177/normal_5fe8e43862ef7.pdfIn PDF document text
    • https://cdn.sqhk.co/rutesawir/aI0qKdG/41788814612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528260/normal_601717eebf612.pdfIn PDF document text
    • http://bogipeborowe.sportsontheweb.net/sakoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449405/normal_5fce8f347b9d4.pdfIn PDF document text
    • http://najelipopusivut.getenjoyment.net/larousse_homeopatia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418565/normal_5ff0ba90be6f1.pdfIn PDF document text
    • http://dekiweragaf.mywebcommunity.org/dekaputexaj.pdfIn PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/xezodezejefakul_xovavabale_zajeburex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414680/normal_60446005e0e4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_60147e4a939b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489415/normal_601fee0e4d97e.pdfIn PDF document text
    • https://tuxativavowaz.weebly.com/uploads/1/3/1/4/131437956/3c54ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408586/normal_60088b47168f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_6057b4ed449dc.pdfIn PDF document text
    • https://ritipovilij.weebly.com/uploads/1/3/4/6/134650849/07c7c0c4c98f223.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/6e94aaab-d4eb-4704-82cd-f4c59a132dbe/feferofubazigox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c48edd49-3243-48ad-a8ef-45059dd10696/88250731477.pdfIn PDF document text
    • http://mukanebesiva.atwebpages.com/critique_of_everyday_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d874ab-dd01-4534-bee1-257d3580e835/bekonematopolijuzagakapi.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_off0000ebb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB9 5564 bytes
SHA-256: 939486847f58addc3c23d9bdc8e19bdf8ae93afb953d00758654dfb4be28e3c8
font_01_sfnt_off0000feaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 10384 bytes
SHA-256: 5c6d24e92b6498e727fc9b35e69d4c2de2113fee8b58eafcc73b66dfdf7fd190

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