Malicious PDF — malware analysis report

Static analysis result for SHA-256 9949c59db2501da7…

MALICIOUS

PDF

88.4 KB Created: 2021-03-18 09:22:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 62ed85667ba3c3909be6ed12cef9d17a SHA-1: df737950b30b9e946128b65450cbd4a63fce20e7 SHA-256: 9949c59db2501da738debbffba22685a07013065c3a6481f9ee27312926c28e3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'zajinet.ru' and containing search terms related to a game download. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious, suggesting it's designed to trick users into visiting a malicious site for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://zajinet.ru/123?utm_term=castlevania+harmony+of+despair+pc++gratis PDF link annotation
    • http://pe50off.info/wirobireruvitww.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475209/normal_603fea04eedad.pdfIn PDF document text
    • http://in-step.shop/homebrewing_for_dummies_free_downloadcimh6.pdfIn PDF document text
    • http://bcipreactivaperu.com/ka_mun_rahrrh56.pdfIn PDF document text
    • http://gutemirofexobu.iblogger.org/addition_and_subtraction_basic_facts_worksheets.pdfIn PDF document text
    • http://photoforce.ru/karate_do_kyohanqamfj.pdfIn PDF document text
    • http://biweekamnf.com/how_long_are_eyelash_extension_courses917u1.pdfIn PDF document text
    • http://nemesun.iblogger.org/kepug.pdfIn PDF document text
    • http://useplafond.xyz/jowevelimufaj44i.pdfIn PDF document text
    • http://baluninelekab.22web.org/59737143127.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458150/normal_5fe68baa1128f.pdfIn PDF document text
    • http://naturapple.space/xiwapofomirisojy6n1.pdfIn PDF document text
    • http://vobefoli.iblogger.org/ti_nspire_cx_ii_t_cas_occasion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452389/normal_5fd63f7a4f70c.pdfIn PDF document text
    • http://mybatut.store/animal_encyclopedia_in_hindi45gke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_d75ab77ad6af4431841ce4f8badd7927.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/good_books_for_3rd_grade_guided_reading.pdfIn PDF document text
    • http://pinogizege.rf.gd/82524958663.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_a4a331e4c3404ad2bfc537109aa2abec.pdf?index=trueIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_83c4ebfe148d44dcbd032ece10ff6b98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/calendario_serie_b_19_20.pdfIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_5e472587c9644e959509993461ac1782.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bokofapig/correct_verb_forms_exercise.pdfIn PDF document text
    • https://db2cba7c-d19d-4716-84d1-34a39f54132a.filesusr.com/ugd/10b03a_e358fa74e695489a9e536103f3257636.pdf?index=trueIn 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_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 8644 bytes
SHA-256: a5bf42eabdf5f01f7771b7c9285353099bb4c9485353ba9d3687af2ca2fc03ce
font_01_sfnt_off0001177e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177E 5636 bytes
SHA-256: e5c0aa12bfe8c2d1d53c52662c312c9901254b6a7b2d5c33258c992245e666bc
font_02_sfnt_off00012a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8E 12552 bytes
SHA-256: 08e903d0c15a8db764db994d6a3e56d85261387e59cef628270ceea20c6b08c1