Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ab90900dbdb7d9…

MALICIOUS

PDF

67.0 KB Created: 2021-03-18 04:51:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b9cb60aa33b42f8b0cd21cdad6afd95 SHA-1: 2af8fd9da77cb70870618e34b895e5bdb1e99365 SHA-256: d6ab90900dbdb7d98b2a21c26eb76e543aa8b75b92da2db0be65e499319678d9
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URL pointing to 'jacksth.ru', which is likely part of a phishing or malware delivery scheme. The document body, though heavily obfuscated, suggests a lure related to a 'Java 8 API scanner'. No scripts were extracted, but the presence of an external URI and the overall classification strongly indicate a malicious intent to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://jacksth.ru/strik?utm_term=java+8+api+scanner
    • https://cdn.sqhk.co/rapekerokemo/3nFKNjc/xizerikodalu.pdf
    • https://cdn.sqhk.co/wepunajexiju/ihhfiiO/38743008078.pdf
    • https://cdn-cms.f-static.net/uploads/4490752/normal_6013b1ad5a473.pdf
    • http://jidudilubad.mygamesonline.org/babiwanasi.pdf
    • https://cdn.sqhk.co/moxofudifafi/hhbPvO6/epileptiform_activity_eeg.pdf
    • http://ponemofetu.scienceontheweb.net/xidoxetubusowupezep.pdf
    • http://nugawijuxuv.mywebcommunity.org/barbituricos_droga.pdf
    • https://cdn.sqhk.co/zezetemirag/rVhgd1b/personal_safety_alarm.pdf
    • https://cdn.sqhk.co/molipigi/hdidYjj/reni_crazy_car_racer.pdf
    • https://cdn-cms.f-static.net/uploads/4386621/normal_60219b952eae1.pdf
    • https://cdn-cms.f-static.net/uploads/4368250/normal_602068f5e3750.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tiluxusimutine.atwebpages.com/what_size_tires_does_a_2009_chevy_malibu_have.pdf
    • https://uploads.strikinglycdn.com/files/dce7317f-fae3-4598-ba06-53d880556624/98565203646.pdf
    • https://uploads.strikinglycdn.com/files/cd56471b-680d-4667-abb3-9b2fdfeb99d1/kifogadimimofimaziwetesow.pdf
    • http://xodolipifonabo.epizy.com/jifejajodoziforowip.pdf
    • https://uploads.strikinglycdn.com/files/d9ad6c46-4154-4268-953e-8933c4fd87d8/salen_and_zimmerman_rules_of_play.pdf
    • http://newewixojarulup.epizy.com/82613937948.pdf
    • https://uploads.strikinglycdn.com/files/8c6080fe-90a7-4714-8b4c-a56e4429a4e2/trouble_obsessionnel_compulsif_medicament.pdf
    • https://uploads.strikinglycdn.com/files/dc88b683-1311-4187-ae39-03cfa42c0def/jawbone_big_jambox_bluetooth_speaker.pdf
    • https://uploads.strikinglycdn.com/files/ea6585ba-a88b-4dc3-b09c-ab0b4bd916f8/who_is_the_half_blood_prince_in_harry_potter_book.pdf
    • https://uploads.strikinglycdn.com/files/9884f892-177d-4af9-a47c-25bf096a5c54/93055600014.pdf
    • http://mubadel.epizy.com/construction_site_traffic_management_plan_template.pdf
    • https://uploads.strikinglycdn.com/files/69de0e38-637f-4ae2-9589-a53ecfa70a54/stephen_hawking_young_sheldon.pdf
    • https://uploads.strikinglycdn.com/files/0a0e838c-b6d6-424d-b094-1bc46a5d4ad4/what_causes_constant_fighting_in_a_relationship.pdf
    • http://lalafen.epizy.com/indenting_agent_agreement_format.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_off0000caae.bin
f7bdd35999fcd11daf826b966cdf82728bcb795fa09522added4ed27237f6c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAE 5136 bytes
font_01_sfnt_off0000dc41.bin
29527cfb1852e646980823c8cfdbedaafb44ad029b710b1eb102f0bbe17cdc54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 10064 bytes

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