Malicious PDF — malware analysis report

Static analysis result for SHA-256 020bda819e89da88…

MALICIOUS

PDF

93.5 KB Created: 2021-03-11 22:54:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b939dc5682a25d85e58af930aaad9005 SHA-1: f23f8cdaf13404aee1887de369b438621aed5658 SHA-256: 020bda819e89da88464432026163551ee5960f59299f8d8b5b8d245a3de8113a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. It contains numerous embedded links, many pointing to disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Balanza de pagos pdf', indicating a potential lure for financial information or a general phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/123?utm_term=balanza+de+pagos+pdf PDF link annotation
    • http://duvotikuvazax.22web.org/kd-avx33_bluetooth_problem.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/zuwurazoku.pdfIn PDF document text
    • http://ladukusuga.22web.org/33047276032.pdfIn PDF document text
    • http://jegewuzewan.iblogger.org/acrobat_pro_2017_multiple_platforms_international_english.pdfIn PDF document text
    • http://kuxufijum.iblogger.org/vocabulary_for_toefl_ibt_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pejefovad.epizy.com/windows_screenshot_shortcut_using_mac_keyboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/581bb684-edc9-43af-ae90-f684ed5c8637/pascal_triangle_6th_row.pdfIn PDF document text
    • http://buxifofokuder.rf.gd/87136758684.pdfIn PDF document text
    • http://fibogexexagiram.rf.gd/42878759974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/558e5002-87cf-4726-9b17-c6db0d9f1411/49981852319.pdfIn PDF document text
    • http://nejasixefunik.rf.gd/philips_276e8vjsb_00.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85fca0eb-b79c-482f-b459-cf2ad57352d3/30607911771.pdfIn PDF document text
    • http://fogaripopuna.rf.gd/86250360956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d886fe2-b8a7-4197-acb4-321ea69f3f92/48686486648.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/advanced_excel_tutorial_2016.pdfIn PDF document text
    • http://vujiwexamofone.rf.gd/elements_of_good_story_writing.pdfIn PDF document text
    • http://bivoxubi.epizy.com/police_crime_report_example.pdfIn PDF document text
    • http://laropijodozu.epizy.com/more_than_average_synonym.pdfIn PDF document text
    • http://jogupasowedeni.rf.gd/48156311023.pdfIn PDF document text
    • http://newiroxupamorik.rf.gd/caution_hot_water_signs_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A49 5212 bytes
SHA-256: 6df2b90efa745782b7e408149c3db53f9f4e19409ea119a97883ed25ed897645
font_01_sfnt_off00012c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C28 11708 bytes
SHA-256: 10d0b307728eda967dac0a108be60b498c27f669031e41f856750736453f553a
font_02_sfnt_off0001522b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1522B 16164 bytes
SHA-256: 4b52fd5da643d9c08cc0a86f773b2f024e3274f3f861dfcac100db1ef433cf06

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