Malicious PDF — malware analysis report

Static analysis result for SHA-256 441bd7558fa38b5f…

MALICIOUS

PDF

72.7 KB Created: 2021-02-18 12:17:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a9dd273d20ad15239a39a2f3b7caeab3 SHA-1: 521fc201140fa10ac73fac51bd17b33b8f39d435 SHA-256: 441bd7558fa38b5fa96bf8b37e6099928b1df847d8c17bb3e8cb9efd5b1a1ab0
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with many pointing to disposable domains and employing UTM parameters, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=what+is+a+great+business+credit+score PDF link annotation
    • http://springital.fun/cryptic_story_the_star_spangled_banner_answersxrunf.pdfIn PDF document text
    • http://1gusevshop.space/analysis_of_blood_report_onlinegjpnr.pdfIn PDF document text
    • http://techanomic.com/ars_magica_magic_system0tnca.pdfIn PDF document text
    • https://vajipexinonadol.weebly.com/uploads/1/3/4/0/134096003/bupukasezitom.pdfIn PDF document text
    • http://rukozhop-guide.com/aria_pro_ii_pe-r60b09cb.pdfIn PDF document text
    • https://kigovedinefetup.weebly.com/uploads/1/3/1/3/131384362/6390500.pdfIn PDF document text
    • http://mini-cam2.club/1486251723707t0j.pdfIn PDF document text
    • http://beautytopshop.site/61173513422qs6uu.pdfIn PDF document text
    • http://prodive.su/bangla_movie_shakib_khan_videogt9y7.pdfIn PDF document text
    • https://doxorovovo.weebly.com/uploads/1/3/4/4/134479089/beguxizidegebi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rawotagetanona.rf.gd/brother_intellifax_1270e_service_manual.pdfIn PDF document text
    • http://nedilopasosugop.epizy.com/company_of_heroes_2.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/vejasomanebufoli.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/80495482801.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/toziniwipuxakofe.pdfIn PDF document text
    • http://mowilutom.epizy.com/apa_format_reference_generator.pdfIn PDF document text
    • http://vedumojaje.epizy.com/bcd_format_converter.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21E 5204 bytes
SHA-256: 0dbf7837080a156561bd8b39f4be839120905d37d9c44f8a68236800ceef7950
font_01_sfnt_off0000e3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 10524 bytes
SHA-256: b01c0136346c1f2dd5793bf7ffd8d8f2c9166296a4cc662b1c4a60336d2d7402
font_02_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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