Malicious PDF — malware analysis report

Static analysis result for SHA-256 61ea40bcb894eb44…

MALICIOUS

PDF

92.8 KB Created: 2021-03-26 09:07:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c997f9dc97c822362e4c200eb3e5a9f6 SHA-1: 9512d3d785f56b856ccc64e43f3bf042c764e419 SHA-256: 61ea40bcb894eb44a6d263e8bdfd8f4e8616af08b7e7996300563e47c50cbf3d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dugedepap.ru/award?keyword=ethnographic+research+method+pdf PDF link annotation
    • https://cdn.sqhk.co/jojojidatun/aRVFvC9/81446416230.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/foboratuzoligejukojigil.pdfIn PDF document text
    • http://merokomazojewi.scienceontheweb.net/novela_aftermath_star_wars.pdfIn PDF document text
    • http://pikegupima.medianewsonline.com/88115114433.pdfIn PDF document text
    • https://cdn.sqhk.co/xogovofofi/HunicJL/party_hard_go_unlock_characters_apk.pdfIn PDF document text
    • http://constructionhouse.info/vijasatwowqz.pdfIn PDF document text
    • http://memowelubi.mygamesonline.org/gopro_hero3_black_edition_default_wifi_password.pdfIn PDF document text
    • https://cdn.sqhk.co/mavixuwaloz/jh9hbu3/welejifomilal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501774/normal_6021792cb5650.pdfIn PDF document text
    • https://cdn.sqhk.co/ramejolir/cjgZPjf/python_stringio_csv_reader.pdfIn PDF document text
    • http://rotiwopofeze.mywebcommunity.org/sorire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402707/normal_601e5fd54d525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_600fedc0bbba8.pdfIn PDF document text
    • http://delozofize.scienceontheweb.net/first_grade_math_addition_coloring_worksheets.pdfIn PDF document text
    • http://jusojixanona.getenjoyment.net/jaligopozujalatizuse.pdfIn PDF document text
    • http://dipunag.getenjoyment.net/yard_machines_rear_tine_tiller_parts.pdfIn PDF document text
    • http://spainsale.pro/wonderlic_practice_test_questions_and_answerspzsnp.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/sumesawoxajew/why_is_howls_moving_castle_not_on_netflix.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/bd_chaurasia_handbook_of_general_anatomy_6th_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/tutilobidujozewus.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/gamsat_practice_test_worked_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E12 5496 bytes
SHA-256: ae8cab12a3655d9d42bbb3a7d26e78a6d8b11b9a215216f13007fcd2a604ec58
font_01_sfnt_off00012097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off00012927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12927 11048 bytes
SHA-256: 1984d8bf757b3eee9391a8410f2ab88f7f8223591ea92c378e86745b637cd6e4
font_03_sfnt_off00014eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EEF 16312 bytes
SHA-256: b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1