Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc4185b27615e77…

MALICIOUS

PDF

88.4 KB Created: 2021-03-07 04:35:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 376f9bb33f087b581930d78f0a8dc0dc SHA-1: ec4c413878555f8e2cce9ff189f338bd0baecf3f SHA-256: 5dc4185b27615e77b6ae23bd24b63dc3f5b0aa96e3ff18e4f75397f2e1cbe3af
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains references to 'Final fantasy 7 strategy guide pdf', indicating a lure to attract users to these external sites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://golowaki.ru/123?utm_term=final+fantasy+7+strategy+guide+pdf PDF link annotation
    • http://micrometer25bill.site/22579138507aeilf.pdfIn PDF document text
    • http://tiktokcopyrighthelpteam.com/78345435784mwg7j.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/4Vgibic/ria_money_transfer_services_private_limited.pdfIn PDF document text
    • https://cdn.sqhk.co/dunokufimove/fKfxidf/dependency_theory_revisited.pdfIn PDF document text
    • http://vuvodagedene.scienceontheweb.net/plane_shift_amonkhet.pdfIn PDF document text
    • https://cdn.sqhk.co/salavogi/efvhdK0/zupodebumuvol.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuluni/2OuhiKq/vufenimovuletuzupa.pdfIn PDF document text
    • http://dexaputanit.mygamesonline.org/susasigidozetobuzum.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/fwUgeie/knock_down_drag_out_fights_clue.pdfIn PDF document text
    • http://romeita.fun/47909777873x2a1n.pdfIn PDF document text
    • http://dragonflysagewellness.com/76053011276sphh5.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/w5icijK/61369100126.pdfIn PDF document text
    • http://newser.site/what_is_the_purpose_of_a_linear_plot_in_literaturelb1w0.pdfIn PDF document text
    • http://goodsun.space/premiere_pro_crackir6nr.pdfIn PDF document text
    • http://umdtheatre.ru/renipufi6y6i9.pdfIn PDF document text
    • http://sodahq.club/6099697407623rvd.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/Bm6ehi6/traffic_racer_cheats_apk_android.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/idkAR90/jiburunudeleloxemosol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_8f9099f8ab1945929de89c900cec97e6.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_561b5b02d94848de94f4cd05be5f12f2.pdf?index=trueIn PDF document text
    • http://vunonam.atwebpages.com/folibigejawaki.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_b0cd049c586745708b8dff780f5d33f6.pdf?index=trueIn 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_off00011c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C73 5348 bytes
SHA-256: 78060741e8b543d7319743ec6ddf8ed7d166b088f3f295bb4554efa48be9781b
font_01_sfnt_off00012ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECD 11084 bytes
SHA-256: 3ce60ba81618309c49a7bfea47564d989ddd0e25da69dd9cfa9177f38b646e1f

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