Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c7612e23e4367d…

MALICIOUS

PDF

76.9 KB Created: 2021-06-04 01:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7a17e2d7e517af5ff6494964c1cb9053 SHA-1: 5c87bd41afefad63c4e2f701710770ed4f03638c SHA-256: 24c7612e23e4367d80849cbf486d4102479efa2fd9ae41ebb89d2816f817bb7a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=html+booking+form+template PDF link annotation
    • https://pujezifug.weebly.com/uploads/1/3/0/7/130738771/6943b28.pdfIn PDF document text
    • https://pozegitewo.weebly.com/uploads/1/3/4/7/134758724/ea43594d2d9c.pdfIn PDF document text
    • https://sujexixapobitu.weebly.com/uploads/1/3/4/3/134328704/4566413.pdfIn PDF document text
    • https://voduzivesaduv.weebly.com/uploads/1/3/4/4/134456438/1023353.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
    • http://sepaxebi.pbworks.com/f/damokunama.pdfIn PDF document text
    • http://negaboxa.pbworks.com/f/94125164093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd0ddd5-9f35-47c1-9320-fd182e51f7d7/does_maschine_mikro_mk3_come_with_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a39d5c0c-2380-43ae-9161-fab52d87b2ed/19705746158.pdfIn PDF document text
    • http://puzavofan.pbworks.com/w/file/fetch/144578892/84768317566.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f7c5ddf-21bf-4eda-8027-a41fb759de4e/83611921808.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/f/puzzle_mania_book_oliveboard_free_download.pdfIn PDF document text
    • http://doxawadar.pbworks.com/f/xojugoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d0126b2-0e13-4bd3-a30b-811290ae6d6f/54328192761.pdfIn PDF document text
    • http://wudiwiligis.pbworks.com/w/file/fetch/144547260/solar_system_pics_hd.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/33363000004.pdfIn PDF document text
    • http://pebegijopolo.pbworks.com/f/permutation_and_combination_questions_with_solution_download.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/f/mepubivititumukutitupipas.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_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 4996 bytes
SHA-256: 9751710cda7df682bf1fc654f540076bb4fbe8dc1133b1f349b5ea0fd7bd6ee2
font_01_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 12248 bytes
SHA-256: 3835f8f7b10cbc1a863804854ab4a190a63cdf0301e06148a7f4e1ac9f46063d
font_02_sfnt_off0001186c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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