Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4979183283c7135…

MALICIOUS

PDF

75.6 KB Created: 2021-06-03 07:42:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6c4c1eb995c6b43655708e683fac2023 SHA-1: ce6d5640595f0ef1e4e19f31efaa06fc520322bf SHA-256: b4979183283c7135610aa0cdf70c266f1524cd800ae7ad120372303023e2792f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF hosts numerous links on disposable domains, suggesting a phishing or malware distribution scheme. The embedded URL points to a suspicious domain, likely serving as a landing page for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://catamma.ru/pbw?utm_term=how+do+you+wind+an+atmos+clock PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471083/normal_604192d7830e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409113/normal_600480663a992.pdfIn PDF document text
    • https://safizasuto.weebly.com/uploads/1/3/4/5/134595990/ae4b3a303fff395.pdfIn PDF document text
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/3770487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503525/normal_603451d15970f.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
    • http://risuxujuvu.pbworks.com/w/file/fetch/144482685/access_grade_6_workbook_answer_key.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/bertelsmann_foundation_transformation_index_2018.pdfIn PDF document text
    • http://werinenimuta.pbworks.com/w/file/fetch/144516972/61192939842.pdfIn PDF document text
    • http://jetubabup.pbworks.com/w/file/fetch/144544638/how_to_use_the_cricut_explore_air_2_to_make_shirts.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/w/file/fetch/144460476/64355202618.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/f/gas_chromatography_in_food_analysis.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/w/file/fetch/144500223/gaterirukijixuwufav.pdfIn PDF document text
    • http://jebusolole.pbworks.com/f/58367595719.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/f/how_to_make_a_cumulative_relative_frequency_polygon.pdfIn PDF document text
    • http://favixose.pbworks.com/f/gemiwim.pdfIn PDF document text
    • http://tukufidanega.pbworks.com/f/supplier_satisfaction_survey_template.pdfIn PDF document text
    • http://vejivab.pbworks.com/f/ejercicios_ortogrficos.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/f/38148621187.pdfIn PDF document text
    • http://zajozote.pbworks.com/f/tuluzenu.pdfIn PDF document text
    • http://ganosidil.pbworks.com/f/13422767814.pdfIn PDF document text
    • http://dejimebez.pbworks.com/w/file/fetch/144420747/will_crash_team_racing_nitro_fueled_be_on_pc.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_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 4972 bytes
SHA-256: 001bf91b031983a1597248b3c4c13472601f41458eb04fcc7adb05797a0e5832
font_01_sfnt_off0000f05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 10096 bytes
SHA-256: a17a0cbd5020e07b553208e3b0643d9c7a181b921f7e5d4f41429c39a5c1eb23
font_02_sfnt_off000112e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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