Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa9ad37db540c86…

MALICIOUS

PDF

76.1 KB Created: 2021-06-07 03:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 93ab877604e81b93d81ac8e6ba7a3c0b SHA-1: 472413dff2d804155a37f75aa08af75cd90b6a32 SHA-256: 3fa9ad37db540c869837fb37b81fcf6bb338d9606c532fc9c7dd8f0307a4babe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards a spearphishing attachment as the likely attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jottigo.ru/123?utm_term=algebra+2+using+the+empirical+rule+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368492/normal_5ffa97a46243e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485800/normal_5fe7b5d3e1413.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500679/normal_5ff54fc377cb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401558/normal_60b8f69831482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482230/normal_605b02d0d86b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465919/normal_600c44bcc114b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372753/normal_6067815ab5dbe.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/d5653d44-f3c9-43a8-a39f-66e264909964/how_to_get_free_robux_2020_no_human_verification_ipad.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144589761/xazemi.pdfIn PDF document text
    • http://sowenux.pbworks.com/f/anatomy_and_physiology_of_eye_indu_khurana_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ff61e9d-47f1-4e2f-a95a-6a2d890b13db/blueprints_emergency_medicine_download.pdfIn PDF document text
    • http://kusarolox.pbworks.com/w/file/fetch/144724722/xusuwifajawuzi.pdfIn PDF document text
    • http://gogoporiwo.pbworks.com/f/6254548504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbca2fb3-be07-4dd7-842a-dc7fbcfda2c2/g_shock_analog_watch_set_time.pdfIn PDF document text
    • http://pejokawigar.pbworks.com/f/fawozana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a1b7f53-9b33-4435-963b-cd84d2ad8da5/51178254173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a6e304-22d9-4458-b181-2e8ea6fdcadc/71147302827.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62561f70-09a5-484e-aa06-2e43b82becb9/have_yourself_a_merry_little_christmas_piano_sheet_music_free_download.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144427794/wolole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/075c2c48-1538-4a8f-99d5-33fef71bf2de/laximotapaludawoguz.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_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 5764 bytes
SHA-256: a32b4771450ce2ad30d59f2abb207bbc0253a7620b23d2ef789f6cf586a7f40a
font_01_sfnt_off0000fd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 11536 bytes
SHA-256: 1d7602fc9bded33673894327ad2f7f511c4ae2c009559a290e26109373378b7c

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