Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aca45811c43727a…

MALICIOUS

PDF

79.0 KB Created: 2021-02-25 17:32:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: debabbc2f3fb87cfbe690561fce3bd04 SHA-1: b054888cd883ba99d6c3a509d7c2b91e99ff87ad SHA-256: 2aca45811c43727a8f09e069527dbb9d7622010e46bfe5b71d07f966a1a26ea2
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. It uses a seed-phrase/secret-recovery lure. 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://jottigo.ru/123?utm_term=sample+iso+9001+quality+manual+free+download PDF link annotation
    • http://robertferrell.net/chapter_3_steven_fernandezb2g3c.pdfIn PDF document text
    • http://help-violation.com/charles_capps_youtube_prayer_that_changes_thingseyezn.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/farewell_my_lovely_film.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/why_is_my_honeywell_thermostat_blinking_leave.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/igHz8gj/14068234374.pdfIn PDF document text
    • http://retamos.mygamesonline.org/guitar_songbook_tabs.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/city_of_thieves_book_amazon.pdfIn PDF document text
    • http://copyrighthelpptteam.com/37728949679ykhzd.pdfIn PDF document text
    • http://paksorond.xyz/uniform_crime_reporting_ucr_programij0j0.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/icGuie8/alan_walker_spectre_dual_launchpad.pdfIn PDF document text
    • https://cdn.sqhk.co/tevosudav/fggfieN/pound_cake_recipes_with_buttermilk.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/why_is_my_samsung_refrigerator_not_freezing.pdfIn PDF document text
    • https://cdn.sqhk.co/vuritukupus/liieif5/8996319009.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/85094474060.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/maxurojinolaxonag.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/nakuzafol/nirexog.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/aging_summary_report_example.pdfIn PDF document text
    • http://pujumek.myartsonline.com/sabitegatajarojex.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_off0000f70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70E 5960 bytes
SHA-256: 9b07ce18de6708a3d281ae2f6973f11a58a4bef81201b91579b0480910660f84
font_01_sfnt_off00010b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B51 10304 bytes
SHA-256: c4a1c9080cd3459c11df7aa75fca2ef46139131e49e8c472147d751ed8d4464c

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