Malicious PDF — malware analysis report

Static analysis result for SHA-256 9497284887dcd4fa…

MALICIOUS

PDF

77.5 KB Created: 2021-05-20 13:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4a1701e84960eb804e1fe5db8733b80f SHA-1: ab5f1c34b77d79533abce11aab8d904e58ebdf42 SHA-256: 9497284887dcd4fad9c722cd1e699161aae090ab7be9b38bed7389fdd1a45bc6
186 Risk Score

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 0.9993

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://botokaw.ru/strik?utm_term=what+oil+goes+in+a+ford+focus PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486042/normal_6058f880e6d2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485935/normal_60677fc0d138b.pdfIn PDF document text
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/dumogodupola_giduniset.pdfIn PDF document text
    • https://judavolegarar.weebly.com/uploads/1/3/1/8/131871921/rulinewodisen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373504/normal_60411b980589d.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/vesidefeju_venosozewupalos_romilidimofubo_nekosaze.pdfIn PDF document text
    • https://rubosesizip.weebly.com/uploads/1/3/4/7/134744628/jumukeb-turewiw-rixofokupoje-nifegok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_601c5bb4ee442.pdfIn PDF document text
    • https://lasaputuvawejep.weebly.com/uploads/1/3/5/3/135314153/rizonu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471467/normal_60546d30a5494.pdfIn PDF document text
    • https://tovibibuxajewen.weebly.com/uploads/1/3/5/9/135968099/fulugot-vobusug-sudopawidawot-tukixavorusator.pdfIn PDF document text
    • https://fanonobumoxevo.weebly.com/uploads/1/3/1/3/131384335/webaputoxeweful.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/2dac61cf-e5d2-4672-b880-e59d7c4691c0/vomukekuvakazo.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/worifipopujowefitimo.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/pajizejefujinir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd9296a-a68d-4d4c-9c44-348c7b07f8a1/what_year_was_the_coldest_in_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f493053e-1e8d-47de-ba2a-8e2a408a8053/how_to_use_tasco_trail_camera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34a1a621-dd48-445b-91a4-28495695bb42/monsters_1st_edition_hoffman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/498f9d9b-f74c-45af-bcb8-f0360953a469/the_leftovers_book_of_kevin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f3de11-c61f-45f8-be16-c4434b2174e6/28316113359.pdfIn PDF document text
    • https://s3.amazonaws.com/vosimalume/wibexun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f29d5431-baff-4ae3-abe6-91e491b8f318/sherlock_holmes_stories_rated.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1d7d717-6627-496c-b957-6e3eb5ebf9a5/33784568337.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_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 5296 bytes
SHA-256: 19944bd5b5c944764d50b9e5317eff8266ad5b6c6811f1cf9709289eb9aaf16d
font_01_sfnt_off00010401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10401 10880 bytes
SHA-256: 73e6896ae99cc5d1744fa6dcb5acbdc3c61bc4b903c83b0d0ece5f818681968e