Malicious PDF — malware analysis report

Static analysis result for SHA-256 08087506a269f541…

MALICIOUS

PDF

83.6 KB Created: 2021-03-10 11:25:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b6a5c3e67a99b4c8cb31c441f225ba7e SHA-1: cf30128154fbef77627113fe5c694eff4d55699c SHA-256: 08087506a269f541439a368eb37c94ede504bb2b817b3979be886972dda14f39
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/award?keyword=makalah+angina+pektoris+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411481/normal_5ff218c6638a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501198/normal_602be63561f03.pdfIn PDF document text
    • http://fijubigatusurov.scienceontheweb.net/reparuzelosojidixomedela.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/what_is_the_most_energy_efficient_infrared_heater.pdfIn PDF document text
    • http://rosipale.scienceontheweb.net/mevevojaxonetukixefaxobes.pdfIn PDF document text
    • http://bodaweziwov.mypressonline.com/39141739498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_602d7da8755fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_603052d3444dc.pdfIn PDF document text
    • https://talurepif.weebly.com/uploads/1/3/4/6/134603846/kigijidikik_vipevilodom.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/ms_sql_dba_interview_questions.pdfIn PDF document text
    • http://wujejejifi.mygamesonline.org/24_hour_clock_worksheets.pdfIn PDF document text
    • https://worivoka.weebly.com/uploads/1/3/4/5/134588103/bipifabivedilew-ruxapik-fufakuta.pdfIn PDF document text
    • https://gupijevud.weebly.com/uploads/1/3/1/4/131407369/a2f07a7da87a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bopubedoru.myartsonline.com/75292020502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/247ecc81-4b5c-492f-a5a2-edd0df9c2d1c/brother_cs6000i_60-stitch_computerized_sewing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/anatomy_animals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835a6a05-3112-4a1a-8446-19007b6774e0/82221305698.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/logitech_m325_bluetooth_mouse_pairing.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/top_performing_companies_in_south_africa_2018.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_off000107bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BC 5372 bytes
SHA-256: b101050db051beef4708e719ba674f868d53c0ea46c47f601008b1936977816e
font_01_sfnt_off00011a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A08 12024 bytes
SHA-256: 3233384e4cfda1427daf590a33465005cbabfaeadd37ba9853ee9979bf4ec51c

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