Malicious PDF — malware analysis report

Static analysis result for SHA-256 850e98b643ab6e1e…

MALICIOUS

PDF

110.6 KB Created: 2021-03-18 12:04:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 323a5e53309f545ed4467512eba31721 SHA-1: 9c6851cd72578dbd4a0ab0673a4c08896ecb903e SHA-256: 850e98b643ab6e1e4455b95a54041157c69ed34e17607a24f12a6277cfd83c2f
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-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://pelibifir.ru/wix?keyword=mapa+del+primer+viaje+misionero+de+pablo+y+bernabe PDF link annotation
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/8367476.pdfIn PDF document text
    • http://zedakobogesa.mypressonline.com/51464149975.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/how_to_change_battery_in_kindle_fire_hdx_7.pdfIn PDF document text
    • http://igcopyrightverify.com/qual__a_populao_do_brasil_atualmentehq6qk.pdfIn PDF document text
    • http://prizinsta.site/warlings_mod_apkelw1o.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/majodolavesamagibo.pdfIn PDF document text
    • http://munupesifak.22web.org/zajumobodirezulokimi.pdfIn PDF document text
    • http://molotkov.site/how_to_study_marketinglwvz3.pdfIn PDF document text
    • http://fasad-dom.site/rhapsody_of_realities_august_2020_freeymtj5.pdfIn PDF document text
    • http://investorlands.ru/component_2_contextual_information_sheetwj4i5.pdfIn PDF document text
    • http://zdsshop.top/sifajale3n144.pdfIn PDF document text
    • http://connexion-amelii.xyz/51714327778bdig5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sokagozu.rf.gd/kejibusejedigezot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc50cd8e-d251-472b-ae05-fc34d016b36a/52659067835.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/which_is_the_best_denture_adhesive_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52542c5a-5783-47b3-8ef5-dbd7233571e0/loxalirelenomumotazipol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c12ab03-0899-474e-b0ef-e9b5214496e2/critical_thinking_movie_review_guardian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0415e343-25f7-47ce-99df-6744b584a3de/77775634224.pdfIn PDF document text
    • http://jepisaf.epizy.com/56607344591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/400e35ac-22ad-4fa0-b2e1-d83af866ca53/14600188526.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_off0001700f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1700F 5488 bytes
SHA-256: dc95501263605b8c3f4578c22ab4c93db755da1c14e5d7ba65e3ac1cc4e8c027
font_01_sfnt_off000182bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182BC 12720 bytes
SHA-256: b1d30d2fc556fbd2261b64f164b6a92ee09118161fa6c742f304844f95ee11ee

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