Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aaa739dff95828d…

MALICIOUS

PDF

68.2 KB Created: 2021-03-19 14:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8c1133bae49f1b9428963215a1f4b9d9 SHA-1: 942e410f4fc06cab2e996a6e5cfb5f99b390572e SHA-256: 6aaa739dff95828daeef5a1081861ad06bf83369821fc297ed7d9dfda8156b51
186 Risk Score

Malware Insights

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

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 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/strik?utm_term=how+to+get+my+samsung+subwoofer+to+work PDF link annotation
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/9d8278657.pdfIn PDF document text
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/1912393.pdfIn PDF document text
    • https://cdn.sqhk.co/gulezepu/fggjdUi/film_american_pie_4_subtitle_indonesia.pdfIn PDF document text
    • https://kofudavobew.weebly.com/uploads/1/3/4/6/134602163/zuxalodas.pdfIn PDF document text
    • https://ganakinupep.weebly.com/uploads/1/3/4/5/134599301/favelaku.pdfIn PDF document text
    • http://duvazejezirofid.22web.org/zevogobotivila.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/jusepujepekokuwinasike.pdfIn PDF document text
    • https://poxesaxe.weebly.com/uploads/1/3/0/7/130738711/juwinaza_lokirupuluve.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/firizapavofodebunav.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/nRhdjg6/weather_underground_tropical.pdfIn PDF document text
    • https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/9a0cf57.pdfIn PDF document text
    • http://joxezorov.mywebcommunity.org/difference_between_grief_and_bereavement.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/g23jhid/craigslist_nh_free_kittens.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/A3hbjbu/european_history_crash_course.pdfIn PDF document text
    • https://folutiniku.weebly.com/uploads/1/3/1/8/131871586/dafuwopufagita_tamixunuzoti.pdfIn PDF document text
    • https://kapekutom.weebly.com/uploads/1/3/4/4/134437999/lewaserosepadexojuni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nijarigu.onlinewebshop.net/mamefegijobeporotur.pdfIn PDF document text
    • http://fejesaj.epizy.com/auditing_and_assurance_services_7e.pdfIn PDF document text
    • http://wasumulavubusol.epizy.com/aadhaar_card_download_without_otp.pdfIn PDF document text
    • http://kojenixerog.myartsonline.com/problem_analysis_report_sample.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/73934283318.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_off0000cd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD90 5416 bytes
SHA-256: 49fa27650bfa76938eb4a6ad09cdee157d17fbf79b23dc3acb974ecda0b62567
font_01_sfnt_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 10264 bytes
SHA-256: a0a4ceaf58fba9289dc1f22a2cde2d9d95ee8501e4117c70d8d708b546a86d07

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