Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9a73710f0ae3e6…

MALICIOUS

PDF

72.9 KB Created: 2021-03-17 22:05:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4cadac9777be24b8610ccad905d8589a SHA-1: 3c9ad09b876195adbc2d0d8aa2c344ee2fc476ea SHA-256: 1e9a73710f0ae3e6dbb9b034208c9b9a0e8942453ac9e66c691450f0647e29a9
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment attack pattern designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=conversion+of+units+worksheets PDF link annotation
    • http://vipmanmarket.space/musical_notes_names_and_symbols4grwj.pdfIn PDF document text
    • http://jaxifas.getenjoyment.net/78146513305.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/968086048.pdfIn PDF document text
    • http://pop-marketplace.ru/soduluxam59xpj.pdfIn PDF document text
    • http://girlita.space/weber_carburetor_manual687tq.pdfIn PDF document text
    • http://thecet.xyz/vodijugutijujemewunuzoue9uu.pdfIn PDF document text
    • http://grigolia-studio.ru/why_did_the_us_get_involved_in_latin_america7c2eo.pdfIn PDF document text
    • https://cdn.sqhk.co/jipobuxaza/agdhdjf/impossible_game_theme_song.pdfIn PDF document text
    • https://cdn.sqhk.co/suxunuke/difysIU/space_invaders_marseille_map.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/counting_on_you_high_school_musical_on_stage.pdfIn PDF document text
    • http://kubosikavudux.mygamesonline.org/what_is_a_drivers_license_document_number.pdfIn PDF document text
    • http://jilunagobag.22web.org/mewujiralawiwavekilet.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/pipupuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/8Pjdhcz/50221355346.pdfIn PDF document text
    • https://cdn.sqhk.co/fefoseto/cMidCjj/wexigadutasugovujujada.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/iggiZEi/overkill_s_the_walking_dead_trailer_gameplay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_bff6f7531bad44b5b508524c04efd0a5.pdf?index=trueIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_be34fa3d2095404c8b2da3e65a327b1b.pdf?index=trueIn PDF document text
    • http://xavitemis.rf.gd/poduzak.pdfIn PDF document text
    • http://gelaleted.rf.gd/26236908594.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_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 4736 bytes
SHA-256: da6c97b7c60de298e392fff0aa0bcc98ee140f665b061811730c0337f9a3a71b
font_01_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 10468 bytes
SHA-256: 5bcd5a9952262d74476f9b777845bb28fd4f7909a60896b1b6deb88ba9c2b19f

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