Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fbe30b17d564e8…

MALICIOUS

PDF

80.6 KB Created: 2021-05-29 19:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e2d5df792cd342f2026789a384681039 SHA-1: e62bcb1aa2a0a2a4c81e2e99ac489545a58d521b SHA-256: 88fbe30b17d564e8172df02ea840f24c6eb3026df864474a581899d1c8a3ce3a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary malicious URL identified is https://kuzutuzo.ru/strik, which is likely used to host or redirect to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=what+is+sony+bravia+remote+code PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417824/normal_60357f1f123f8.pdfIn PDF document text
    • https://sotezogurew.weebly.com/uploads/1/3/2/7/132740991/569507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466161/normal_60450fc58ed5e.pdfIn PDF document text
    • https://nogenovone.weebly.com/uploads/1/3/4/7/134745979/2634442.pdfIn PDF document text
    • https://gikeviviku.weebly.com/uploads/1/3/4/7/134707445/jatibokonusil.pdfIn PDF document text
    • https://nozezezolakufu.weebly.com/uploads/1/3/2/6/132695232/zivitawuluxapi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376088/normal_5ffca723bf52b.pdfIn PDF document text
    • https://tivenudonokokom.weebly.com/uploads/1/3/0/9/130969369/jaxavipup.pdfIn PDF document text
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/e58690173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_6066d23f176bb.pdfIn PDF document text
    • https://jumewabob.weebly.com/uploads/1/3/0/7/130775497/rulesetovog-varoduwile-kibirufolevajiv-gepewonaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/06836c65-bacd-4f21-b9c9-9c454d769a61/tricky_maths_questions_and_answers_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7640c6e9-195a-4ae7-937e-94c7709aa099/50246750739.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc090c4-e01a-4131-944b-f93a6c4cbcff/65260697411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfa43820-75f6-42ed-a3b2-437a393d127f/wosirebetanuneleb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/756021d4-48e8-45cf-88da-c780028ce282/dezufutawotowo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd581c9-136e-45be-91c9-31ce19e3f9c0/cherrypickers_guide_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f52bf55-684f-44a7-9af1-50d3b38a37b5/86468254643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95bef63b-7117-4a52-8617-2bf4952fe474/72888067871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a24aa290-12ab-430f-a63c-bc8e04745458/how_to_read_mq3000_fingertip_pulse_oximeter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/846ad660-ca75-434f-a0fc-e75908d84dfc/kakutobajidiwurenasir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/490d18f0-db6e-40bd-b94f-6b9dc6406217/statistical_reasoning_for_everyday_life_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f69bd2de-8efd-4409-bc75-3b95befd68a0/nenolovadajo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 5252 bytes
SHA-256: 24412ead9ab623a8650e79c0cc2a74c03271ce2ba0c64aa15fd3f5a35f8d2570
font_01_sfnt_off000101e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E1 10888 bytes
SHA-256: 3dc4702bb584db6a03d2372455d7c7339515c0134e4cce0d02966555145ae644
font_02_sfnt_off00012700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12700 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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