Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48b37f3062fe75e…

MALICIOUS

PDF

73.4 KB Created: 2021-03-02 16:52:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 48a133f67d4098c3c5c6b5c840510b33 SHA-1: 9d72239535e6881384230e99c0ca8604b483fd76 SHA-256: f48b37f3062fe75e5f4f4b0631c6bff8d3a76a9553cff0fdf7c8f57b9f2067ad
126 Risk Score

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://ponafet.ru/123?utm_term=how+do+you+calculate+odds+in+statistics PDF link annotation
    • http://sonuzevemuguke.iblogger.org/business_english_lessons.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421940/normal_60132b45ce116.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384825/normal_5ff589fc87bc5.pdfIn PDF document text
    • http://peuer.xyz/8842643802oflyu.pdfIn PDF document text
    • http://jozebemi.iblogger.org/active_and_passive_voice_exercises_with_answers_for_class_8.pdfIn PDF document text
    • http://jawomubinuj.iblogger.org/where_to_donate_used_clothes_and_shoes_near_me.pdfIn PDF document text
    • http://malapiwo.66ghz.com/worksheets_community_helpers.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/xerox_workcentre_7855_specs.pdfIn PDF document text
    • http://maroron.22web.org/cadimage_for_archicad_19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408319/normal_5fc9c6bb93113.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joxugodeluda.rf.gd/adobe_premiere_pro_cc_2017_softonic.pdfIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/georges_secret_key_to_the_universe_movie.pdfIn PDF document text
    • http://vugoban.epizy.com/mufumokurosijutugaderula.pdfIn PDF document text
    • http://pulupalu.epizy.com/domewobovilodap.pdfIn PDF document text
    • http://bogepep.rf.gd/vuzixub.pdfIn PDF document text
    • http://wojixefem.epizy.com/vudujalitokumipukisuj.pdfIn PDF document text
    • http://zovixiluru.epizy.com/14252384894.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_off0000e1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C2 4992 bytes
SHA-256: 1ff008f478195a3dd8643858c9617b808515d358780ba2da18e98dd203c96147
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 10936 bytes
SHA-256: 01c37b84c89eed44cb1cca28971b98beace9447475fa63a732f83fa867e7e8ec