Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e8c41efa1e9617…

MALICIOUS

PDF

75.8 KB Created: 2021-03-20 14:06:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 95149f34227ce51e3b662525218e58a6 SHA-1: 15f57a251a6b49195b3cdb3c15b9a121f8a13b3f SHA-256: 17e8c41efa1e96172b7e379ddcc7d33f35e5cd0823f744dc8872edc3529cdd56
126 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, specifically as a phishing trojan. It contains an embedded URL pointing to 'kuzutuzo.ru', which is likely used to redirect the user to a malicious site. The PDF structure and embedded content suggest an attempt to disguise malicious intent, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/strik?utm_term=easy+tamil+songs+guitar+chords+for+beginners PDF link annotation
    • https://dunexekexafu.weebly.com/uploads/1/3/4/6/134622254/leteduvutugifef_kikiw_tonivag.pdfIn PDF document text
    • http://migajipanijezep.22web.org/sentiero_degli_dei_map.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/G1lZjf1/metal_radio_stations_denver.pdfIn PDF document text
    • http://vexawenebo.22web.org/adding_and_subtracting_fractions_practice_worksheet_with_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469350/normal_603d02dc5f6ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_6042f6356a9fe.pdfIn PDF document text
    • https://toroborelap.weebly.com/uploads/1/3/4/8/134867907/watug-tisozuragevev-kajolokifogil.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/fWjhjh8/973360514.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/AfOUje7/plus_points_expiration_united.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fe728c496df4.pdfIn PDF document text
    • https://maxuvejalova.weebly.com/uploads/1/3/4/2/134265339/rexitipekowakepa.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/hggc4gg/big_win_hunter.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a03609a6-eafc-4585-bee0-e7a4513f36e6/41524088504.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/wimitexis.pdfIn PDF document text
    • http://givonomiruf.rf.gd/identidades_trigonometricas_fundamentales_ejemplos_resueltos.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/printable_superman_cake_templates.pdfIn PDF document text
    • http://tagetebaj.rf.gd/list_of_filler_words_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37332824-562a-49b9-8e1b-4830934d5ddd/what_is_the_role_of_internal_audit_department.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69189fc6-0c06-472b-b726-8e7dbfac2f96/hidden_object_printable_puzzles_for_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/360_ergonomic_baby_carrier_manual.pdfIn 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_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 5636 bytes
SHA-256: 2d3f6dcda3081041c93a2492154facd22e4906b4104c9b7253c827bf03b05d86
font_01_sfnt_off0000fe55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE55 10388 bytes
SHA-256: 6fc829ad86cc3e08a9cbdc835113061e32292e2efbb3e326c1a37034d77b337a

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