Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d59743196297e4…

MALICIOUS

PDF

70.6 KB Created: 2021-03-08 13:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 20c3fba79ffe29dc6449dc22e1a7612b SHA-1: 9e2b01be45b25c08e86d85cd58f5677fc71661b5 SHA-256: a6d59743196297e44aee508dc2c57e326ba77907246bceeefa8c9eb6bf91b715
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=performance+review+sample+for+employees PDF link annotation
    • http://goldstein.berlin/what_is_i_in_hieroglyphics4747j.pdfIn PDF document text
    • http://pixelbarista.com/tudosiwapipewkh42.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/wpf_tutorial_and_code_samples.pdfIn PDF document text
    • http://energierecrute-emplois.com/belkin_n300_router_software7idoy.pdfIn PDF document text
    • http://dulexip.22web.org/basic_exponent_properties_worksheet_algebra_2.pdfIn PDF document text
    • https://jowetirepenu.weebly.com/uploads/1/3/1/3/131383619/zanevutexewowig.pdfIn PDF document text
    • http://wifejopoxakobo.iblogger.org/samsung_j106h_combination_file_free.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/puzijirodej_nevidutosupuki.pdfIn PDF document text
    • http://romeoplanet.club/34354221936i2qrn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jevopuvejamiv.epizy.com/78687554176.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_387576549d4e43af92a60e7d69b739dd.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_64d893c0604241058586350b31f1ffd5.pdf?index=trueIn PDF document text
    • http://mojozore.myartsonline.com/why_excel_file_format_is_not_valid.pdfIn PDF document text
    • http://mapureju.epizy.com/tasedubefipizuv.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_0a7b24232e954aac881540bbdf85a514.pdf?index=trueIn PDF document text
    • http://sebipukavore.epizy.com/xegiwepogevewameputiz.pdfIn PDF document text
    • http://todonoto.epizy.com/sun_mann_bawra_song_pagalworld.pdfIn PDF document text
    • http://dimugowu.rf.gd/p21_paint_cleanser.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD885 5416 bytes
SHA-256: 2461b1efcd4b0e49c3f7c0ea53a61344be35ccf43a5b525d314fe369e913ca05
font_01_sfnt_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 10056 bytes
SHA-256: 6c64805e054dab89f9b471155d6b75dca7b2150d3f68a1fb3ba63dae40a344b6