Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8ff8aeaafb618c…

MALICIOUS

PDF

78.5 KB Created: 2021-03-14 17:37:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 30d9af22b6c4fb57a4ad08db242f28d5 SHA-1: 16d2aea6d79e258833a456bb0e95fb89549f71c2 SHA-256: 3b8ff8aeaafb618cce7572179a192585dfd267107f8db623baea47aa24372f88
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9992

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=is+general+physics+1+hard PDF link annotation
    • https://cdn.sqhk.co/ropobemuma/hbaL1hg/messenger_kids_on_chromebook.pdfIn PDF document text
    • https://ridoduna.weebly.com/uploads/1/3/4/5/134528127/1454852.pdfIn PDF document text
    • https://wubedekajonew.weebly.com/uploads/1/3/1/3/131380741/rezanaropazapefa.pdfIn PDF document text
    • https://kigilepoda.weebly.com/uploads/1/3/4/9/134901239/mowitaxale.pdfIn PDF document text
    • http://siwupojotuj.getenjoyment.net/neer_art_and_archaeology_of_the_greek_world.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/yAhdDsR/reganezevavedasof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453338/normal_6027cb9a4f33c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_60345828d8845.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_60122dc09a824.pdfIn PDF document text
    • https://futilupotozuvat.weebly.com/uploads/1/3/1/4/131454482/ae4956.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/djet2hf/59908553506.pdfIn PDF document text
    • https://cdn.sqhk.co/riragimi/mQdV18G/famefedif.pdfIn PDF document text
    • http://rawitotizoxuk.scienceontheweb.net/93787384876.pdfIn PDF document text
    • https://susafoxepi.weebly.com/uploads/1/3/0/7/130775374/4976808.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/W9ijVji/21888094669.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370767/normal_60053eb29cbdc.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/64542b20-04ca-44aa-a342-c53ff1006e2a/how_to_watch_marvel_movies_in_order_of_events.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b82385ce-c658-4ae0-8c99-fe64e10031c0/way_to_go_child_support_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/904df1ef-a781-421c-b765-59c81e0b05bd/electronic_battleship_advanced_mission_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c312e182-af68-42f1-98b1-1c59e32bf23f/alfred_all_in_one_piano_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ac3c61-e235-4002-a1ef-d1cf165b9590/power_quotes_broken_hearted_tagalog.pdfIn PDF document text
    • http://kemesid.onlinewebshop.net/revas.pdfIn PDF document text
    • http://kojenixerog.myartsonline.com/do_you_still_get_paid_for_leave_of_absence.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_off0000f459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 5424 bytes
SHA-256: 1e2dcac94eb08b073421c967b70da5aa8f13e408f122c82a6ff9df1710d5b68f
font_01_sfnt_off000106d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D3 11200 bytes
SHA-256: 2e0d16fb2f6e21e0b8250bec9157306102e8e9d5d4549a88ac9ec03b15ea7799

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