Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b52b9a53913974…

MALICIOUS

PDF

79.6 KB Created: 2021-03-15 05:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 46b04cdc89c70e7c15a2844f3d826f4c SHA-1: 590d99c854404a66af181620fa37d2c77821ac4a SHA-256: 91b52b9a53913974b14d77ed038dd2fcccc2e11d10dff4cf687d18de0d9f96fd
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://resalured.ru/strik?utm_term=why+won%2527t+my+samsung+tv+connect+to+the+internet PDF link annotation
    • http://nimiridisavir.22web.org/an_etymological_dictionary_of_the_english_language_walter_william_skeat.pdfIn PDF document text
    • http://disetikala.22web.org/52241813830.pdfIn PDF document text
    • http://fuxakuzaporelu.iblogger.org/surgical_cases_for_medical_students.pdfIn PDF document text
    • http://xizesagig.iblogger.org/abs_food_grade_plastic_full_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_748eed8958ec4dadbb5f2cf52e635d98.pdf?index=trueIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_479f3dec8bb745aa888e4582210f60b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/janodojivi/feterabamirekoxatagobeb.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/visual_studio_2019_shortcuts_cheat_sheet.pdfIn PDF document text
    • http://bonubenevutura.epizy.com/archimate_model_exchange_file_format.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/belunaratexi.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/pencil_sketches_easy_girl.pdfIn PDF document text
    • http://tulakitukubipi.epizy.com/65645603270.pdfIn PDF document text
    • http://wofowixululi.epizy.com/genere.pdfIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_72602f67524a46c0a6db401016c31a18.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zijivevip/sowajenobesopizirare.pdfIn PDF document text
    • http://zumaborelap.rf.gd/network_rail_e_learning_pts_answers.pdfIn PDF document text
    • http://koxepari.rf.gd/81613005639.pdfIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_2dc775b891bd4a1a922aa910e192eeb4.pdf?index=trueIn PDF document text
    • http://rowisumemosil.rf.gd/3150129151.pdfIn PDF document text
    • http://vodobugatusexa.epizy.com/curriculum_vitae_template_new_zealand.pdfIn PDF document text
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_67582a77aff24c87ab58e06e1218de9d.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_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 5480 bytes
SHA-256: 2eb8ed3fa3808de48c64aa2ed6c6b25ddef9b262650855a0299211b1dce4b267
font_01_sfnt_off00010d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D90 10352 bytes
SHA-256: 5415bd55229d1f50dfb8edfd5f262f34e931e8f31f044aed81141030027825b4

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