Malicious PDF — malware analysis report

Static analysis result for SHA-256 b188505e72fdca1c…

MALICIOUS

PDF

84.2 KB Created: 2021-04-03 04:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8fdd9bad9001268e6d4c0fc8555a256a SHA-1: ebefd6ef895eba35aae46e261863a0d29d1f8f54 SHA-256: b188505e72fdca1c7c46e48a1aa48fb4d5b3e413e2750fdc07dec5c49e2c0db0
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains an embedded URI pointing to 'zajinet.ru', which is likely part of a phishing or malware distribution scheme disguised as a free tutorial. No scripts were extracted, but the PDF structure and embedded URI suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://zajinet.ru/award?keyword=python+language+tutorial+pdf+free+download PDF link annotation
    • http://saxosoxajivovud.medianewsonline.com/gubajarivege.pdfIn PDF document text
    • http://triple-doska6.club/2817853983707hpo.pdfIn PDF document text
    • http://phrensy.co/32992591299snpxq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_5fd8e9ab4d79a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413373/normal_5fc953e153759.pdfIn PDF document text
    • http://trujillostacoshop.com/michigan_current_covid_numbers_by_countyh59ea.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/coleman_powermate_5000_carburetor_rebuild_kit6fc4g.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/mudikolavimotomutukekuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447640/normal_6043f4738b596.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477878/normal_600133697e358.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_6015ac5a3729a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xebuvuwov/what_is_knowledge_graph_embedding.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/difference_between_project_and_program_management.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/keynote_flowchart_template_free.pdfIn PDF document text
    • http://fufudaloxola.onlinewebshop.net/fixumes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24c718fa-d0a7-43f4-8570-28a45a249981/easiest_way_to_pass_nasm_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/201df045-4f41-46aa-b9eb-1278b2b77a76/how_many_quarts_of_oil_does_a_2016_lexus_rx_350_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b74906c-c256-4684-a707-a07a05ed5a4e/how_to_add_minutes_on_tracfone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0285d173-b484-43ad-a5ed-db50820c7e06/kijimakalofupuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a5d9a0b-7416-4377-b19a-72e305cdb286/writing_idiomatic_python_jeff_knupp.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/50083395096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43b6d830-8daa-4ea8-a59b-43e86b92df25/what_is_a_montessori_teacher.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c8ee673-280e-487b-ad34-5f2fa7cbe106/harry_potter_wand_making_diy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e4975b-aff4-4b61-a900-ff24a74e221b/58105632783.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/dadez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/315a7f71-73c9-4dd6-9db1-c6d031e09e48/pivorebigokuvukipugojofo.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_off0000fda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 5200 bytes
SHA-256: 6de37372834730f7744ce8c170cbd37dc7dd3d4daeccb167e33d0b475d669dfe
font_01_sfnt_off00010f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5B 10332 bytes
SHA-256: 361435dbe959dd445a7772b930273a56e107950123de60049580315a6434c19f
font_02_sfnt_off000132cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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