Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fb50bf3952ea40…

MALICIOUS

PDF

77.9 KB Created: 2021-04-04 03:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fe83ad776fb44dd476e7adbad3818b33 SHA-1: b0d6bcd1c2eef0291d6174dd307c687c3b377c13 SHA-256: a0fb50bf3952ea40636c11e565e7d451030b1c8bea617a54a80ed21a8e7c0d33
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to search queries, reinforcing the lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/award?keyword=microbial+staining+techniques+pdf PDF link annotation
    • http://vivetosatirora.iblogger.org/how_to_fix_premiere_pro_not_responding.pdfIn PDF document text
    • http://linorusani.iblogger.org/91049674472.pdfIn PDF document text
    • https://cdn.sqhk.co/ritapabinap/uhdpijC/36679076677.pdfIn PDF document text
    • http://vutanari.22web.org/comparing_fractions_to_decimals_worksheet.pdfIn PDF document text
    • http://lutokororale.iblogger.org/70514812188.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/gcRC9lO/the_day_zombie_city.pdfIn PDF document text
    • https://cdn.sqhk.co/bikuloxisage/hdcygiU/telugu_stickers_for_whatsapp_ios.pdfIn PDF document text
    • http://muldwych.com/wetigudopuxuguxifaxzvjm.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/Ige2die/revenge_of_the_ninja_full_movie_1983_download.pdfIn PDF document text
    • http://makedctl.site/520948853332eazk.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/xhbgdG2/pejawegusudalalugonopu.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/9EhahcU/ps1_emulator_for_pc_games_download.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/legapatatezisa/5751059699.pdfIn PDF document text
    • http://vefilemegukur.epizy.com/rimotuginofo.pdfIn PDF document text
    • http://joxumokuri.epizy.com/87845197102.pdfIn PDF document text
    • http://tixelupaninaber.rf.gd/accounting_system_software_philippines_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/rikijapexokutamawut.pdfIn PDF document text
    • http://nuzirimelosav.epizy.com/87276867371.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/cara_membuat_cold_brew_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/volhard_temperament_test.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/70092306060.pdfIn PDF document text
    • http://befadiw.rf.gd/exercises_simple_past_irregular_verbs_negative_form.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_off0000f41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 5688 bytes
SHA-256: c089c17980c1dfa4031fdf32d3491eaeb2b81567bcfc281b3bd897dc2fa10369
font_01_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 10320 bytes
SHA-256: 48c41d81c5481aaa475a769fb00f4a2ff8bb4ec1d77e9a2922deb6b431f6e1ff

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