Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63db6bd2aabb896…

MALICIOUS

PDF

80.7 KB Created: 2021-03-22 03:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2229cc0e5a56f8f04afd0cd4ec46cb2e SHA-1: 2cca1e3e9c43b072c2ecb9e6790e20307cf9b07d SHA-256: b63db6bd2aabb8966ac5254719bf4035d4025daaa2986a6479b591b8ba9b65a6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'quiz answers', which, combined with the external links, indicates an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests this PDF is designed to distribute further malicious content or phish for credentials.

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://midufefew.ru/wix?keyword=how+to+get+all+answers+right+on+canvas+quiz
    • http://fejekadiwoxobiz.getenjoyment.net/notes_on_camp_met_gala_meaning.pdf
    • https://static.s123-cdn-static.com/uploads/4490001/normal_5fcb677e34c08.pdf
    • http://kapabifidi.sportsontheweb.net/zifagekogazubaparizuz.pdf
    • http://sowipilarow.mygamesonline.org/how_to_write_a_step_outline.pdf
    • http://kazexajisodibu.medianewsonline.com/mavibomit.pdf
    • https://cdn-cms.f-static.net/uploads/4411686/normal_602dab95bde32.pdf
    • http://potuxoposutu.medianewsonline.com/vojaxuronomebagug.pdf
    • https://static.s123-cdn-static.com/uploads/4480588/normal_5ff4d6295de4c.pdf
    • http://sebevifa.getenjoyment.net/jutanutomowisav.pdf
    • https://static.s123-cdn-static.com/uploads/4454163/normal_5fcf11813f01d.pdf
    • http://jarisudowapebi.sportsontheweb.net/96878932134.pdf
    • http://lobabinuladeri.medianewsonline.com/how_do_you_clean_a_bissell_powersteamer_powerbrush.pdf
    • http://sumigemag.mywebcommunity.org/bigosaturufolipaduv.pdf
    • http://pebonemariv.mypressonline.com/how_to_eat_fried_worms_movie_rating.pdf
    • http://burivuvuju.medianewsonline.com/adhesives_technology_handbook_3rd_edition.pdf
    • https://cdn-cms.f-static.net/uploads/4420230/normal_605652a894a26.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wobanunep.myartsonline.com/wobupedifenirodiwojogowu.pdf
    • http://lojubefogugiku.onlinewebshop.net/14420174875.pdf
    • http://vipuzala.myartsonline.com/ansys_apdl_commands_tutorial.pdf
    • http://satogitexuvo.myartsonline.com/latex_symbols_full_list.pdf
    • http://teropisarazo.myartsonline.com/72614438043.pdf
    • http://sebokegekesuded.atwebpages.com/tasodelufug.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_off0000fa8f.bin
0978d29c9cdb7c8424f8aa2d808824b28cdea4cffb68558070be9576e26e6230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 5348 bytes
font_01_sfnt_off00010cde.bin
22ffb3c43f7982a098d4dbe72f1456868bf046dcf3be306ce2f8195b4bcea45b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 11904 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.