Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0ec16958a6164c…

MALICIOUS

PDF

79.9 KB Created: 2021-03-30 01:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 05b4cc8d303949429b9eb70f161dd5b2 SHA-1: 645dfccc58f2add0c2b8696c4988f29f3fba2e3b SHA-256: 6f0ec16958a6164c98ab61187f0ed30f284e7f7f01dc2c80f280d397b711cd06
126 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent external URI pointing to 'dugedepap.ru/award'. The PDF's structure and embedded links suggest it is part of a link farm designed to redirect users to potentially malicious content, masquerading as academic material.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/award?keyword=academic+ielts+reading+test+pdf PDF link annotation
    • http://siwevizinoguji.22web.org/tigazurevawizabi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446273/normal_6041b4f6325fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_60178012b9c48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374838/normal_5feb4ebc06240.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418778/normal_5ff434e4bc49b.pdfIn PDF document text
    • http://galufixagomedo.getenjoyment.net/basic_english_grammar_and_sentence_structures.pdfIn PDF document text
    • http://wijuviniwak.iblogger.org/wells_fargo_401k_withdrawal_form.pdfIn PDF document text
    • http://fogimikolasot.iblogger.org/bidding_list_template.pdfIn PDF document text
    • http://tigibisolefora.mygamesonline.org/94703243253.pdfIn PDF document text
    • http://mefizilexofe.66ghz.com/61945008432.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://uploads.strikinglycdn.com/files/7b0fa911-37ac-4c6c-ac73-6b6018832f5d/lezunozaranonigukokarebam.pdfIn PDF document text
    • http://dogabofeki.epizy.com/azure_cli_file_from_blob.pdfIn PDF document text
    • http://wajifinome.epizy.com/ach_mandate_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56290a78-2ff6-471d-b9b3-6e901daaee4b/how_to_tell_if_nest_thermostat_is_working.pdfIn PDF document text
    • http://xaminelabiz.epizy.com/36418489336.pdfIn PDF document text
    • http://wekidezeze.epizy.com/86286344238.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/at_cafe_6_sub_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/zetixarilonaxidasope.pdfIn PDF document text
    • http://davofunup.onlinewebshop.net/76295782629.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/what_age_can_you_get_your_drivers_permit_in_new_york.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a32151-b319-440a-a2e2-f030c5008738/bluebook_19th_edition_footnoting.pdfIn PDF document text
    • https://s3.amazonaws.com/xeponodij/gariseza.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_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 5140 bytes
SHA-256: a6f2663a3e46038c6fc928fa75ca2b3dbf1a15daf0c82bb21c64b366af4aaf6d
font_01_sfnt_off00010005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 10552 bytes
SHA-256: 6ff0834495cc04eb3302821ed9d5a38a873b38e46c3f706d4ae760607e9e280f
font_02_sfnt_off000123f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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