Malicious PDF — malware analysis report

Static analysis result for SHA-256 56605864b9bfeba0…

MALICIOUS

PDF

80.0 KB Created: 2021-03-20 13:57:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0adb4994b47461ca0df15c8d427e4aee SHA-1: 9ca193888e526af682ee93e68f2843e3b6346aec SHA-256: 56605864b9bfeba0073d9137c99505b0828153c089f0633bfe2efbf9bf1bf2ab
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9996

Heuristics 4

  • 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://bologen.ru/strik?utm_term=how+the+grinch+stole+christmas+full+movie+2018+english+free PDF link annotation
    • http://kengoru.space/kifefimoxenuripotonukifonua8p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_6040ba4282193.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505102/normal_5fea0e2d49ed6.pdfIn PDF document text
    • https://cdn.sqhk.co/jedivejuruwo/jghhXG8/arabic_language_app_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366337/normal_5fe472c38a891.pdfIn PDF document text
    • https://cdn.sqhk.co/dowepigakaw/iHwojg9/joyous_celebration_songs_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/jitegoji/gggpicQ/3015212468.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454556/normal_60017a3f5b76f.pdfIn PDF document text
    • http://naturfresh.fun/symbol_scanner_settings_barcode90vpl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_601c6196c2be7.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzojivemepe/aihicF7/browsing_history_on_android.pdfIn PDF document text
    • http://ig-soft-team.com/846627697737or5w.pdfIn PDF document text
    • http://teachost.com/zemoxodejiz6wj3y.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/InjcEIv/mini_games_pro_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/cWNirui/barbershop_inc._poki.pdfIn PDF document text
    • http://itagreen.fun/why_is_my_booklet_printing_upside_down8u9yt.pdfIn PDF document text
    • http://logmeinnow.xyz/90238399059t1aj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487419/normal_6026250c2dd86.pdfIn PDF document text
    • https://cdn.sqhk.co/buzodafevuj/dgjxHjd/napiwovugazedux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485176/normal_5fe5e7324c164.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415944/normal_601e5a57485d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424405/normal_5ffa950d7eab4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 5928 bytes
SHA-256: d57f301bc04e14a40f98115daa15ef4a57942bf561d4cad7e58f94577d14bd6b
font_01_sfnt_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 10904 bytes
SHA-256: 143036f174a57c99508682d433aae7eebde6d8eba81d4b9d7585141367df7d88

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