Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7fc8f75c998909…

MALICIOUS

PDF

80.0 KB Created: 2021-03-15 03:34:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b3492fe95e5c0de4701392ebbc339e81 SHA-1: 5348815ab72d3a983fe2d99834f86b0756d2ff6b SHA-256: 0f7fc8f75c998909c07ceb9462236527ae0b9c5743f6e7a4ba64fde191ed3361
126 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, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'kuzutuzo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to an English proficiency certificate.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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/award?keyword=certificate+of+proficiency+in+english+5+pdf PDF link annotation
    • http://talajudoxuxip.mygamesonline.org/47955698905.pdfIn PDF document text
    • http://lenagilos.22web.org/vmware_vcenter_converter_standalone_5.pdfIn PDF document text
    • http://makelemeg.mygamesonline.org/detailed_lesson_plan_in_english_5.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/30182694707.pdfIn PDF document text
    • http://nituzovido.getenjoyment.net/xojuwamafugegesivijur.pdfIn PDF document text
    • http://bubokap.iblogger.org/business_brochure_design_templates_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/active_voice_and_passive_voice_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9637afb1-043c-4d1b-b5e3-e48c5d303e56/why_did_netflix_remove_grinch.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/65603075541.pdfIn PDF document text
    • http://zifunugol.epizy.com/gofakaladewazidixif.pdfIn PDF document text
    • http://koduwutuvage.onlinewebshop.net/dasazoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a6dbabf-f57a-498b-b810-3922ba33537b/fabas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f775e5ff-5576-4df5-ba78-9d183d8bc3ce/spanish_to_english_translation_app_free.pdfIn PDF document text
    • http://sufutogikid.rf.gd/ps_vita_2_2020_release_date.pdfIn PDF document text
    • http://divojeniro.epizy.com/memabag.pdfIn PDF document text
    • http://rinimodosejowuf.myartsonline.com/legislao_da_administrao_pblica_angolana.pdfIn PDF document text
    • http://weboxezave.epizy.com/dudelofesosamojasigop.pdfIn PDF document text
    • http://sulenovigadi.myartsonline.com/que_es_la_artemia_salina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e50928-29e9-4178-b548-25c587566d7a/sizajevofoxikugudajir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e061f8-8cf4-47da-8469-9596ee11c85a/whats_the_best_modem_for_centurylink.pdfIn PDF document text
    • http://xewenofos.epizy.com/what_is_a_good_mechanical_pencil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 3396 bytes
SHA-256: a1590c7f5208dc8548bc60c975f0ad55d8fb019de21164224c277915181a96ff
font_01_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 5548 bytes
SHA-256: 885e86608efaf2c58c4bbc032bd9d69b8b37e00c752070eb8cfc242c3aa8b687
font_02_sfnt_off0001073e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 13108 bytes
SHA-256: 76ec0b98020944722445e5aa8bea9f96db1cf7b2706aeb15a000fe49ee054829

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