Malicious PDF — malware analysis report

Static analysis result for SHA-256 386f0c840fa380ed…

MALICIOUS

PDF

76.1 KB Created: 2021-04-25 13:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3cfe74212fee534053bf03f2eaafb0f9 SHA-1: 539e030b91088ed21b6db8b9eaebab9c92546d8f SHA-256: 386f0c840fa380ed15995d0642196830cc050ce6058762f2c287aff3c4d39322
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 0.9996

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://nipisod.ru/strik?utm_term=what+is+the+meaning+of+composition+in+english PDF link annotation
    • http://mabay.fun/census_2020_maharashtra6x9qg.pdfIn PDF document text
    • http://lesifipi.22web.org/potefupikeni.pdfIn PDF document text
    • http://tesepaxe.iblogger.org/persuasive_speech_outline_template.pdfIn PDF document text
    • http://sodaapp.pro/is_there_a_reset_button_on_a_garage_door_openerxc2k8.pdfIn PDF document text
    • http://instapresent.site/galozominokemiwipibobiplpc18.pdfIn PDF document text
    • http://mybatut.store/araxis_merge_zip4p3mb.pdfIn PDF document text
    • http://kufigada.22web.org/android_go_edition_rom.pdfIn PDF document text
    • http://qupieasy.online/764402689597dn6n.pdfIn PDF document text
    • https://sisasava.weebly.com/uploads/1/3/0/7/130738988/914cef9aa362.pdfIn PDF document text
    • http://minuette.me/what_is_the_meaning_of_unity_in_art05yyf.pdfIn PDF document text
    • http://ximuvitu.iblogger.org/wuximerewazarevipolo.pdfIn PDF document text
    • http://segekofolopumav.iblogger.org/how_to_set_up_zojirushi_rice_cooker.pdfIn PDF document text
    • https://komutezux.weebly.com/uploads/1/3/1/3/131398036/gepenesog.pdfIn PDF document text
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/7411063.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vunizi/62300250149.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/nec_change_request_navpers_1221_6.pdfIn PDF document text
    • http://wuxininozikup.rf.gd/65809221895.pdfIn PDF document text
    • http://garulolit.rf.gd/holiday_extras_competition_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/ear_anatomy_and_function_worksheet.pdfIn PDF document text
    • http://gozotonitiki.epizy.com/maruti_alto_lxi_spare_parts_price_list.pdfIn PDF document text
    • https://s3.amazonaws.com/kafises/18773034931.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_off0000ea97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 5344 bytes
SHA-256: 410ef82f570473cad045093c11474d4f25d411c47e412d0cceeb0a3615f76a54
font_01_sfnt_off0000fcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBC 11156 bytes
SHA-256: 1bd266c79ac762ec46d3fd36f9380da019901dc42322370f93fce287370a774d