Malicious PDF — malware analysis report

Static analysis result for SHA-256 9631e20bb704c81d…

MALICIOUS

PDF

76.0 KB Created: 2021-03-01 12:28:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 68df5daa5b74b58a9f23aa7b71d267cd SHA-1: f9c2fdc6cee7d0297cad482aef23e7f603c412f5 SHA-256: 9631e20bb704c81d017a074a9a2b4838122f6290e226b579cb72dd7a39a1a941
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing lure. The document body, though heavily obfuscated, appears to be related to search terms for vehicle manuals, likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/123?utm_term=2004+chevy+silverado+owners+manual+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459636/normal_5ff15ed74e1f0.pdfIn PDF document text
    • http://mujoxoluvisukid.getenjoyment.net/motilukavuluxuvesanodo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417830/normal_5ff2320753fdc.pdfIn PDF document text
    • http://help-copyrighteamservice.com/diary_of_a_wimpy_kid_the_long_haul_film_castknsh8.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/EjcyHjf/78342160740.pdfIn PDF document text
    • http://extraterrestrials.space/thinking_maps_trainingtd037.pdfIn PDF document text
    • http://melodabogaso.66ghz.com/online_video_link_generator.pdfIn PDF document text
    • https://cdn.sqhk.co/remozemot/vjfYleM/20903163836.pdfIn PDF document text
    • http://citrus-fruit.space/how_to_drain_a_caldera_hot_tubkrjt7.pdfIn PDF document text
    • http://doresal.22web.org/67849742627.pdfIn PDF document text
    • http://mobeditobaxul.scienceontheweb.net/coleman_powermate_3750_generator_gas_tank.pdfIn PDF document text
    • http://podorokufexapal.iblogger.org/brutal_type_bold_font_free.pdfIn PDF document text
    • http://copyright-securityx.com/tipos_de_comunicacion_oral_panel6ve0y.pdfIn PDF document text
    • http://in-step.shop/50663389848ee1nf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabenejajoko.myartsonline.com/muxudoba.pdfIn PDF document text
    • http://jitawidavez.atwebpages.com/what_is_power_dissipation_in_cmos.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/vetejofalenuwuxevisudon.pdfIn PDF document text
    • http://runesufosufej.rf.gd/apcolite_premium_emulsion_shade_card.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/aadhar_card_online_asking_for_password.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/gate_fold_brochure_template.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/xufepuleleja.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_off0000ea9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 5916 bytes
SHA-256: 47d1d6be23963f85e2ce0f8740d7de784404a8343edb4887b8489a05a6c0be84
font_01_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 10512 bytes
SHA-256: c7b5e28b25064c7989f17ce43d27ec8599f0ccd03a6a26294c4dff15ce418f00

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