Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ccaa673d95eb8e1…

MALICIOUS

PDF

84.1 KB Created: 2021-03-28 18:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f639289b15aacf2a9bf96afded71944c SHA-1: 84764033d1bd73762ab2425db07ae08b451b0df2 SHA-256: 3ccaa673d95eb8e133c5cdf241feec7bb16f34aca257a6b49679a009ef6d8a60
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a large number of external links, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=forge+crafting+mk11
    • https://puwaxitakobesod.weebly.com/uploads/1/3/4/1/134109073/zodadedurabuzu.pdf
    • https://cdn.sqhk.co/pijujuweg/jfTY4hg/lemon_bundt_cake_recipe_ina_garten.pdf
    • https://cdn.sqhk.co/naludibeg/fjgx9jd/format_factory_iphone_x.pdf
    • https://gegiwozik.weebly.com/uploads/1/3/4/7/134719936/6102792.pdf
    • http://mobeditobaxul.scienceontheweb.net/wave_motion_numericals.pdf
    • http://lokubakodo.getenjoyment.net/affairs_cloud_computer_quiz.pdf
    • https://cdn.sqhk.co/pometobab/fjiuEgf/vupavet.pdf
    • http://tavafotuzefox.sportsontheweb.net/wenuzefabaje.pdf
    • https://tefajakitom.weebly.com/uploads/1/3/1/3/131378990/2650359.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://getomewemoxut.rf.gd/84092196495.pdf
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_68f19c5b72424016939c77978d0e7e7a.pdf?index=true
    • http://vigukesege.epizy.com/todoginukizojet.pdf
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_fda156dfeedb4ab9a544485a4de18b05.pdf?index=true
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_d1e4e7a050754de3aab006422688fcbb.pdf?index=true
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_309bd0fbcdcc45d1b49f277203f58637.pdf?index=true
    • http://mepitar.atwebpages.com/contract_acceptance_letter_sample.pdf
    • http://bopewexe.onlinewebshop.net/dapatosu.pdf
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_f887a3480ebb43a6b8d535e9fb3065d9.pdf?index=true
    • http://rurebirafana.epizy.com/tamigezipotawusu.pdf
    • http://kafopazam.epizy.com/attestation_de_loyer_caf_2020.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_off00010ad8.bin
1eb6d86451b50e03a2c39868e7b49e43cfe477fad26dfdf6f9cc56530fd04f6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD8 5064 bytes
font_01_sfnt_off00011c14.bin
46d5932181b8d57cec48a6d24f23c277db3dc00691fa7d55eaf653948386ca4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 11192 bytes

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