Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbdbfe95fa5ba17b…

MALICIOUS

PDF

78.3 KB Created: 2021-03-28 00:47:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bba169b149a50458a322deae32e5af94 SHA-1: 231a738aad33b91643e9058816287b7d021ae292 SHA-256: cbdbfe95fa5ba17b2ee81ce85c07e2ef5db8f186859035f1e9f5e5075853469e
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting, suggesting a link farm designed to distribute malicious content or facilitate phishing. The primary malicious URL identified is https://lozipotod.ru/strik, which is likely used to redirect users to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=can+you+tell+me+a+little+bit+about+yourself+interview+question PDF link annotation
    • http://trujillostacoshop.com/police_vs_crime_online_complaintzy5uw.pdfIn PDF document text
    • http://datingdate.site/the_idiots_are_taking_over_bassjix8r.pdfIn PDF document text
    • http://stroiline74.ru/4_pics_1_word_level_2390_answervexqx.pdfIn PDF document text
    • http://outputqwvk.space/24232726845mjtzb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wefadep/zidunemakixosovesevipow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07d8f6ce-5592-42d8-8d59-7431585d2748/2162212121.pdfIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_677e7fd2f0044d5f979721f8f31074d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec5c13fe-ac24-47f9-a0ce-d891726aa9fd/guess_how_much_i_love_you_fabric_bundle.pdfIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_d0b7e33a380b4290a36a3b0e39a55ec8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/bts_song_album_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3f6a7d-e3e7-4cbf-afe4-e90dc28a8261/6056616553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86a150da-0765-408f-93ad-5b1ecfb2e1af/how_much_do_physicists_earn_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/comunicacion_para_personas_con_discapacidad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/251a4560-d26c-4b0c-9ece-3ed0444de2ed/hp_deskjet_2512_ink_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23ac5f5-88f6-4ff7-a775-3abd0e738ce8/what_does_1020_mean_on_cb.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/brian_greene_books.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_2cd032c8c58a48d392441f112d54f6ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a8c3e24-9b6a-45d1-a336-bdc2857198ff/download_do_driver_da_impressora_hp_deskjet_ink_advantage_2546.pdfIn PDF document text
    • https://s3.amazonaws.com/subopukomanaw/taotao_110cc_atv_performance_parts.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_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 5340 bytes
SHA-256: e7f48eab08567d96c171d3190f0d97543942116f7535abaa47049dd5d916ec0c
font_01_sfnt_off0001062c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062C 11032 bytes
SHA-256: 8c742409860e41af71a1a714c03b3c0da6d9b09d970fb0ec70df1d6fc7e8a7d0