Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b332eafbeb6f6a5…

MALICIOUS

PDF

78.2 KB Created: 2021-04-20 08:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edf6245aa1b039bd490c9c8c5c257fbc SHA-1: 95fdc5585351b2ae814e476ac29c17b8140d8fd4 SHA-256: 0b332eafbeb6f6a5cd5997ba4611d9043153e6b518696c6bcfcabb506e20a150
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting, and a high ML classifier score indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=heat+exchanger+solar+water+heater
    • https://cdn-cms.f-static.net/uploads/4402478/normal_5fd88a5c6f870.pdf
    • http://womirewuzakuf.sportsontheweb.net/brand_positioning_strategy_using_search_engine_marketing.pdf
    • http://vikiduxa.mywebcommunity.org/14284047910.pdf
    • http://tuzirawejaw.mypressonline.com/poverty_alleviation_definition.pdf
    • http://pefiworawodud.mypressonline.com/fogadamerope.pdf
    • http://stavki-na-sport.site/vofexuvofuzuwipetolekuru1nzys.pdf
    • http://wusator.mygamesonline.org/jijuvodutufulove.pdf
    • http://ziwusis.getenjoyment.net/how_do_cfds_work_trading_212.pdf
    • http://wubujonil.getenjoyment.net/sunbeam_heated_throw_problems.pdf
    • https://cdn-cms.f-static.net/uploads/4422645/normal_605ffac68289f.pdf
    • http://chambreapp.xyz/399889447349zoz1.pdf
    • https://cdn-cms.f-static.net/uploads/4407081/normal_603f4d2aa8efd.pdf
    • http://zisuroto.mygamesonline.org/wiwasuf.pdf
    • https://cdn-cms.f-static.net/uploads/4454672/normal_60321926171b6.pdf
    • http://jawazapefaxuzit.mywebcommunity.org/tabam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tuzuxutetug.atwebpages.com/82617125477.pdf
    • https://uploads.strikinglycdn.com/files/8503b57a-51d0-4d2e-944f-fda5167ab04f/1747194417.pdf
    • http://gukutimaguvuzum.onlinewebshop.net/funegis.pdf
    • http://fukuselumetu.myartsonline.com/adobe_reader_for_windows_10_free.pdf
    • http://kimawawasero.onlinewebshop.net/noida_map_download.pdf
    • https://uploads.strikinglycdn.com/files/04bed185-23cb-45e2-8d54-54412968528a/lemezisogizim.pdf
    • http://jelunegizubu.atwebpages.com/kibubosemusobanobije.pdf
    • https://uploads.strikinglycdn.com/files/f6a03f52-21ac-4f7f-af9b-2db5d5d17e20/pozajuzewivana.pdf
    • http://ropupifalapoges.atwebpages.com/biology_textbook_grade_12.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f645.bin
f0a33e4d38cb0a7cde508c050a8716260e446a26bd6b6af972d21798311968cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 5180 bytes
font_01_sfnt_off000107f3.bin
1df70441db8e7205fcf89a79a41cbf9424e9509fcc6d1d8dbc59b70a671b6a45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 10388 bytes

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