Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d755f857e3be28…

MALICIOUS

PDF

70.2 KB Created: 2021-02-11 02:59:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 950b3e482df73350e576cb2e80bdd494 SHA-1: d4c38ed19c3104eeec7b50fd2e0d5b09c93f49ea SHA-256: 24d755f857e3be287b0a19bb1f7d56db6fb9faf56cb46e7b8b9c2e32d4553a3f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1059.003 Windows Command Shell T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning attempt. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a shell, a common tactic for executing malicious commands. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the combination of link farming and command execution lure points to a malicious document designed to trick users into running arbitrary code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/123?utm_term=sega+model+2+emulator+mac PDF link annotation
    • https://noxagutut.weebly.com/uploads/1/3/4/4/134483949/xitoru.pdfIn PDF document text
    • http://berabujadew.22web.org/ayushman_bharat_in_tamil.pdfIn PDF document text
    • http://guwajokuxo.22web.org/galileos_viewer_1._9_free.pdfIn PDF document text
    • https://cdn.sqhk.co/xamozafi/fjjgfXI/dagub.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/ujdghA3/retopiki.pdfIn PDF document text
    • https://cdn.sqhk.co/wanaxowuwot/cijahab/weed_legal_states_2020_virginia.pdfIn PDF document text
    • https://kunudixi.weebly.com/uploads/1/3/4/6/134667289/penobawes_zamisel_jenalarin.pdfIn PDF document text
    • https://cdn.sqhk.co/mojazejo/hijjgV8/nuwadikifovugape.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/1ifhfVR/bogefizirepigulat.pdfIn PDF document text
    • https://lepabamun.weebly.com/uploads/1/3/1/6/131636917/bekevane-fubowinifevelo-wekopazimekegor.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/jitjh8W/html_br_style_color.pdfIn PDF document text
    • https://cdn.sqhk.co/xubulozirod/D9jfji3/foxegututifotemopa.pdfIn PDF document text
    • https://cdn.sqhk.co/pimidima/q2X2Hjb/heartstart_mrx_m3535a_service_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://befojarariwowab.epizy.com/neural_network_tutorial.pdfIn PDF document text
    • http://xefivaz.epizy.com/89946498032.pdfIn PDF document text
    • http://lekololekepogip.rf.gd/trombone_choir_sheet_music.pdfIn PDF document text
    • http://besikinugid.epizy.com/latest_tcs_aptitude_questions_and_answers.pdfIn PDF document text
    • http://lazubabalitun.epizy.com/carnivores_ice_age_pro.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_off0000d5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BA 5316 bytes
SHA-256: cd036df5d3f324e7fff53b1deeff4ffab4909c24ed4188a84c89770c7b5a108e
font_01_sfnt_off0000e7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 10824 bytes
SHA-256: 4fd6f21a4a99d4f9c7697ef4ac65cfc03d353922a59308996e5ef84a144be1ca

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