Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb25cc960ed50b47…

MALICIOUS

PDF

74.2 KB Created: 2021-04-03 07:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a7de1595426bf0dfe613649ec657f236 SHA-1: ebd2ae9fe6dc0a1351756c65930a2ef96967ba82 SHA-256: cb25cc960ed50b4771aebb910e190d581ffface239884f49725266ff26978ccf
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO manipulation campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://jumiwimov.ru/strik?utm_term=the+second+estate+of+the+estates+general+was+made+up+of+the PDF link annotation
    • http://autolombardpro.ru/c_programming_language_tutorial_point34uj9.pdfIn PDF document text
    • http://bet-info.ru/muvuxivxu3t.pdfIn PDF document text
    • http://on24-system.club/456717240854tx66.pdfIn PDF document text
    • http://circus.market/74297102007ampus.pdfIn PDF document text
    • http://1xbet-registrat.site/speer_reloading_book36i30.pdfIn PDF document text
    • http://detonic-ordina.website/drift_away_uncle_kracker_chordsalknu.pdfIn PDF document text
    • http://worldhold.online/73732071109dpt2j.pdfIn PDF document text
    • http://bloomwithdeanna.com/91125022542r2tij.pdfIn PDF document text
    • http://koprovk.xyz/664800392763set0.pdfIn PDF document text
    • http://bottlechainworld.com/sikatop_seal_107_precio_homecenterdmu5t.pdfIn PDF document text
    • http://salestore.pro/melepefekilaweginizevekued5mk.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/c05abb0e-fec2-4ca6-b744-138f9c1f9a22/xubakefeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf7f3bc-2ed0-4e12-aab9-b78441569e89/what_is_the_value_of_a_2007_chevy_impala.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_7167406001de4e0db035f27cd8eb37ae.pdf?index=trueIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_6a0ff764839545c38cada1236986eca1.pdf?index=trueIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_829192e93f3843b7801cce64f81cc223.pdf?index=trueIn PDF document text
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_f70bd6ad5fcb497892ec34a77d049380.pdf?index=trueIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_2de3b011776d41ed9268a09a7b0a8c99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/caeb6b76-64ff-44f7-b3dc-52a780c298b2/59428953402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36aa7c45-1bc5-427d-a0c9-53329aac13fa/xewepafe.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_f94c9efcfed64816bcc35e365337f283.pdf?index=trueIn PDF document text
    • https://c9977776-9e37-4432-9eae-e541147807da.filesusr.com/ugd/bb6cc6_f4d7b074be6d44a5ac747c1258047bc7.pdf?index=trueIn PDF document text
    • https://dc5ca969-d333-4582-9879-b719aca70d73.filesusr.com/ugd/760c43_51c3d77da4dd4bb1a3652b572a2dd4ae.pdf?index=trueIn PDF document text
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_eb70ef64ea7b4a57aaecc41fb98e31ef.pdf?index=trueIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_65fd500eb41d46aaa343e9f02acaeb56.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/702b73f7-df86-4e8d-9098-0a232119ae63/pukilawun.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_off0000e547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE547 5612 bytes
SHA-256: 84272bfd3543e827b3bf8f4a63fa9836c6e3eb0c55412942ddec8110ae862c6e
font_01_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 10044 bytes
SHA-256: 555865a3e082c257d137e1e4fefc82b16296951e4d73290a2ec81a0749e9378b