Malicious PDF — malware analysis report

Static analysis result for SHA-256 99369def7fb52557…

MALICIOUS

PDF

86.1 KB Created: 2021-03-04 04:06:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4bd919bc0130395a082e87dd9192b9f8 SHA-1: 77134869d41e81e6ecec2d294612a7d7f3591ccd SHA-256: 99369def7fb52557ff4c5ccc2c09a2dfb227c3ce19c7c4993a858fbe2582cefa
134 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with one specifically identified as a lure related to 'medical billing and coding books'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting a phishing or malware distribution scheme. ClamAV detection and ML classification strongly indicate malicious intent, likely to redirect users to malicious sites.

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pelibifir.ru/award?keyword=medical+billing+and+coding+books+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479240/normal_5ffffab6aa637.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/0idighb/88797330992.pdfIn PDF document text
    • https://cdn.sqhk.co/tizadufof/jcqiegd/toy_story_drop_scene_3_level_51.pdfIn PDF document text
    • https://cdn.sqhk.co/xojoweva/ibuhcKp/quality_management_definition_business.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/hbRhihc/sepotolirodapezod.pdfIn PDF document text
    • http://nuveclovet.xyz/how_do_i_get_my_nespresso_vertuo_out_of_descaling_modeqbedj.pdfIn PDF document text
    • http://vopibuxipem.22web.org/rigexi.pdfIn PDF document text
    • https://wajutuba.weebly.com/uploads/1/3/4/6/134656264/7856fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387709/normal_6010d2e645628.pdfIn PDF document text
    • https://cdn.sqhk.co/gitopedevid/hchdcjg/12113825182.pdfIn PDF document text
    • https://rugilebeme.weebly.com/uploads/1/3/1/3/131380811/7121363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484399/normal_5fd26ea918d7c.pdfIn PDF document text
    • http://probnik1313.tech/sapopivebfy6e.pdfIn PDF document text
    • http://devicesprotectionforusers.site/nightside_of_edenvrvnq.pdfIn PDF document text
    • https://depopuxa.weebly.com/uploads/1/3/4/8/134893869/xafujij_tetuvuzuravuzu_fobepovowo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sukepavudopuje.epizy.com/juki_ddl-555_repair_manual.pdfIn PDF document text
    • http://mafolizol.rf.gd/13371248271.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_off00011377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11377 5496 bytes
SHA-256: 8f0433a7fc063194cffd989242595737c8d79294b3e9c4029245022db67863d5
font_01_sfnt_off00012644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 10900 bytes
SHA-256: a1cc0c483e9fde083bec7aa7326fab49cdf2b5b9536c84a93381f8611cf3aeaf

Open this report in the interactive analyzer, or submit your own file for analysis.