Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f5edbcbcc9500b…

MALICIOUS

PDF

83.7 KB Created: 2021-05-19 05:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76cba6d0a9826e5e5baf778bdad5a99a SHA-1: eaebe5a182605faa2162cda45cc93aea7ce3c7ae SHA-256: a8f5edbcbcc9500ba292e149c609dc318264e95fc7e1d174a64549873a6ae303
104 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of an embedded URL pointing to 'jacksth.ru' suggests an attempt to redirect the user to a malicious site, likely for downloading a secondary payload. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the phishing or social engineering aspect of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=minecraft+more+ores+mod+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rujesuluxure.rf.gd/cambridge_igcse_physics_end_of_chapter_answers.pdf
    • https://s3.amazonaws.com/lijopavexanuse/strength_training_exercises_no_equipment.pdf
    • https://uploads.strikinglycdn.com/files/d2ffe87e-b125-43d1-962a-4b236b211c1f/58742258419.pdf
    • https://s3.amazonaws.com/kobivimelelo/tigipepubavudi.pdf
    • https://s3.amazonaws.com/vabedafozo/apush_causes_of_the_civil_war_dbq.pdf
    • https://s3.amazonaws.com/puretulenuza/chamber_of_commerce_pakistan_membership_form.pdf
    • http://xomikinexeb.epizy.com/bhagavatam_stories_in_kannada.pdf
    • https://s3.amazonaws.com/tometubufimopim/charts_and_graphs_worksheets.pdf
    • http://jepisaf.epizy.com/59153229226.pdf
    • https://uploads.strikinglycdn.com/files/ba1ff50d-9aee-4b64-b1e6-c067c1a809eb/razor_e200_battery_replacement.pdf
    • https://s3.amazonaws.com/kisimujuk/police_staff_application_form_examples.pdf
    • http://latajixow.epizy.com/66669573397.pdf
    • http://jobupozedud.epizy.com/land_acquisition_definition.pdf
    • https://s3.amazonaws.com/gedesisumi/how_to_get_hp_deskjet_2630_wifi_password.pdf
    • https://s3.amazonaws.com/babuxufarizuxur/here_is_new_york_democracy_of_photographs.pdf
    • http://sejisetelasisel.epizy.com/abas_ii_scoring_manual.pdf
    • http://wusekugu.rf.gd/nukajutegino.pdf
    • https://s3.amazonaws.com/fenatagazise/bamuw.pdf
    • https://uploads.strikinglycdn.com/files/9332593e-a061-4644-9da3-e6e0681fd240/59338105711.pdf
    • https://s3.amazonaws.com/satulibaren/aluminum_sheet_farming_persona_5.pdf
    • https://s3.amazonaws.com/mozirolinitaje/clockworkmod_recovery_zip_file_free.pdf
    • https://s3.amazonaws.com/zopenave/48692373474.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f090.bin
084427931497e076c763e1d8c5a1d72bcfc623a6ceb204224a421c77fd2f6d91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 5264 bytes
font_01_sfnt_off0001027d.bin
d2a40f06f6872733a69e34ae25f69dd72f3a935a0ddbb9b46b6581c802ca5fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 12836 bytes
font_02_sfnt_off00012c5b.bin
b2cf57f29eb3b5e0c174876c58b70ef8fadd81916e6e05a17acc225f9629e7e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5B 16064 bytes

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