Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c3f0339d981f80…

MALICIOUS

PDF

80.6 KB Created: 2021-03-17 13:23:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6af71c6fd866487038c10c8664c8f85b SHA-1: 99a4e7aad3de811e8f3ed3745a4e8d51f0200ca4 SHA-256: 92c3f0339d981f80053f4a9ae70ccc37f299b13f5debdcad060106af4b3a251f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of links pointing to disposable or unknown hosting services, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the classification as a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/award?keyword=arturia+pigments+manual+pdf PDF link annotation
    • https://cdn.sqhk.co/wuzirixowev/YGjeHEc/86084155530.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/ejghegc/blanchiment_dentaire_laser_formation.pdfIn PDF document text
    • http://komomutuba.22web.org/texto_expositivo_explicativo_argumentativo.pdfIn PDF document text
    • http://molosorew.iblogger.org/25067873870.pdfIn PDF document text
    • https://cdn.sqhk.co/lizupasepafu/Fhcr3jf/lixixe.pdfIn PDF document text
    • https://cdn.sqhk.co/vumojakizaw/hagc4gj/reversible_reaction_integrated_rate_law.pdfIn PDF document text
    • http://vabuletarikinil.iblogger.org/3275148340.pdfIn PDF document text
    • http://kekemubitaf.iblogger.org/eclipse_for_selenium_automation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_3fa3c7e046974094bfd764861dd60825.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6de9522-25ed-4d55-8f91-c4aa1fbad837/sonic_the_hedgehog_wallpaper_border.pdfIn PDF document text
    • http://wowinagapujepok.epizy.com/84151436751.pdfIn PDF document text
    • http://vufagozujidivu.epizy.com/33028972763.pdfIn PDF document text
    • http://pavejovubebus.rf.gd/26696499629.pdfIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_799de0c10a1548c4b47f3a0addcdd22c.pdf?index=trueIn PDF document text
    • http://dowirimidezifa.rf.gd/citrix_receiver_4._8_for_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d2625c-2fe1-4796-8cd4-e69ae218abad/64625862748.pdfIn PDF document text
    • http://vebaxabono.epizy.com/converting_between_metric_units_worksheet_year_6.pdfIn PDF document text
    • http://zukusadefu.epizy.com/banting_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8430024-2c65-4ff3-b696-edd5e4412162/2007_jeep_grand_cherokee_3.0_diesel_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfdd51ad-1eda-4f88-b099-a11727607f56/how_to_do_digital_dog_portraits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/407bd4bd-1300-4ee4-a9d1-8ca4cab965fc/97418466307.pdfIn PDF document text
    • http://xodemomawul.epizy.com/6474910643.pdfIn PDF document text
    • http://mulirogikek.epizy.com/projeto_meio_ambiente_ensino_fundamental.pdfIn PDF document text
    • http://babevuzax.epizy.com/diccionario_psicologia_clinica.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_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 5348 bytes
SHA-256: 67b5ec33983f835bb7455dba574d82e5d7470bee5aac0fc1dacf9adaf0864bf2
font_01_sfnt_off00010c41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C41 11988 bytes
SHA-256: 7c1e30aadd57676b80d2b5ebc35ff17a9a00fa42a4f1708a760201690c5d7f3c

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