Malicious PDF — malware analysis report

Static analysis result for SHA-256 3789b9792ed43ed2…

MALICIOUS

PDF

91.1 KB Created: 2021-03-18 17:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9f290a3df4bafdfd44eb06d3d2f4030 SHA-1: d404d3d03778aeeb168014c2514a06170536c249 SHA-256: 3789b9792ed43ed2a4f9f1b91eb28447ec136751ab684bb53ec857a5ada0637a
156 Risk Score

Malware Insights

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

The file is a PDF document flagged as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, and a critical heuristic indicates it's a lure for recovery secrets or private keys. No scripts were extracted, but the presence of an external URI suggests an attempt to direct the user to a phishing or credential harvesting site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://resalured.ru/123?utm_term=exceptions+in+java+questions+and+answers
    • https://cdn.sqhk.co/nofevemumidu/gf2he4r/piano_keys_chart_for_beginners_printable.pdf
    • https://cdn.sqhk.co/sovokeduseb/ObNrXij/july_1864_civil_war_battles.pdf
    • http://viteroludobano.mypressonline.com/adobe_acrobat_x_scan_to.pdf
    • https://cdn.sqhk.co/lexikegije/cmgPNih/download_cookie_dozer_mod_apk.pdf
    • https://cdn.sqhk.co/bogovureg/ggxhehh/fitbit_versa_2_special_edition_review.pdf
    • http://keruluzo.medianewsonline.com/cowboy_bebop.pdf
    • http://galosidijixiwu.mypressonline.com/how_to_descale_a_keurig_2.0_machine.pdf
    • http://xaduwojitodefo.66ghz.com/category_management_in_procurement_and_supply.pdf
    • https://cdn.sqhk.co/gusorewiwal/hOBhdt5/daily_expense_sheet_format_for_home.pdf
    • http://kexisugotiro.22web.org/photo_editor_with_blemish_remover_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/50425150-8cbd-402f-b2fa-d343ffb9c578/ejercicios_verbos_irregulares_en_espaol.pdf
    • https://uploads.strikinglycdn.com/files/c73cddb1-9605-47f5-897e-db173110f14e/68392299913.pdf
    • https://uploads.strikinglycdn.com/files/2eaeea23-0f62-4b45-8ec5-35d31a634305/casio_gzone_flip_phone_battery.pdf
    • https://s3.amazonaws.com/lunojol/tapofasofapakuwe.pdf
    • http://pozijawikubinun.myartsonline.com/satoj.pdf
    • https://s3.amazonaws.com/sorapobuk/free_web_browser_mmorpg_games_no.pdf
    • http://wumugaronekupaz.rf.gd/bedelli_askerlik_bavuru_klavuzu.pdf
    • https://uploads.strikinglycdn.com/files/763d73d2-03a6-4ff6-a32a-9be973436b95/75836616405.pdf
    • http://dazulenaredon.rf.gd/94024615477.pdf
    • https://uploads.strikinglycdn.com/files/2e070c47-7e38-4906-9162-a5a2ebec377a/argumentative_essay_examples_for_ielts.pdf
    • https://uploads.strikinglycdn.com/files/15be24a2-50be-4797-9113-7f251f65d368/workpro_1000_chair_manual.pdf
    • https://uploads.strikinglycdn.com/files/7f19abd7-1670-4a31-bd43-a358e732cab9/94673192298.pdf
    • http://rususekobijo.myartsonline.com/porque_estudiar_administracion_de_empresas_yahoo.pdf
    • http://bazuliditufo.epizy.com/86630521089.pdf
    • https://s3.amazonaws.com/risisipajole/platform_sparkly_silver_heels.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_off000122a3.bin
e4cbc5e485639e69d8de0132c12d81cf61a7a962fffd3f4e59ef736ecbfd0f42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 5412 bytes
font_01_sfnt_off00013537.bin
d721317da4a0a38a62f2013550be95f9e23c670880a203ef2a86fe8ff92a6a78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13537 12264 bytes

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