Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ec1cf29838d8b3…

MALICIOUS

PDF

86.5 KB Created: 2021-03-06 09:02:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6ad043eb96bb4e83a131478becd8fe9 SHA-1: 190b5bff3da8e38754f182b342022de9b582d09f SHA-256: f4ec1cf29838d8b30ee2a69d0ba2e5bfc78f9a0eb7a7afb6c6f7bda38129126f
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a primary focus on directing users to a domain associated with phishing and link farming. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a common search query to entice clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/aws?utm_term=why+won%2527t+my+fitbit+charge+2+read+my+heart+rate
    • http://pazefezos.mywebcommunity.org/niviwixotupaf.pdf
    • http://vemusopudin.22web.org/bexejoj.pdf
    • http://deemonatrafik.xyz/homeschool_curriculum_reviews_secularvxpf4.pdf
    • http://zesigosaf.22web.org/57112968314.pdf
    • http://nikibolerobika.getenjoyment.net/verbos_regulares_e_irregulares_en_ingls_ejemplos.pdf
    • http://dizurexemubegog.mygamesonline.org/55160512406.pdf
    • http://zujadise.scienceontheweb.net/26454102435.pdf
    • http://warowusavi.mywebcommunity.org/parking_turtle_bay.pdf
    • http://bigijawiv.scienceontheweb.net/jadufebax.pdf
    • http://pozufopajosel.mypressonline.com/60492969619.pdf
    • http://fastnoutservice.ru/masters_in_business_analytics_in_usa_without_greer1l7.pdf
    • http://vuwobide.22web.org/wasefirekozitefazogu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/54aafbba-1697-4161-a265-c58fb572c653/a_number_decreased_by_8_is_at_most_14.pdf
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_58b3c4e2f2b845d9aaae1a0a72a4f2aa.pdf?index=true
    • http://kigexozuzexozo.rf.gd/pixuvuwelirim.pdf
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_d9ebe29734a84b6cbd9f0e50804739bf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4eb685cc-e372-4c1b-82da-134a004880d5/alan_watts_quotes_dream_of_life.pdf
    • http://vavazewesepato.epizy.com/business_plan_sample.pdf
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_c44eeb6f79744379981fe7d0a2056f51.pdf?index=true
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_73dbe986c999452cb8497e6b3da45547.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a411161d-5e0b-4fa5-a588-4f76f5042f00/gajemiluwiwumotofinabezaz.pdf
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_a5540ebcf91142c0af0de472e5ea1dec.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b148bd9c-516b-4143-b4d4-9371989a45e8/migokeres.pdf
    • http://zesafemumibow.myartsonline.com/will_a_crib_sheet_fit_a_pack_n_play.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111f8.bin
9c1a6b896e8304ede4b72e61bf9cf0ed805b1a261c6ab32e43992e2508595036		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 5736 bytes
font_01_sfnt_off00012581.bin
1a5be1ef9dae54c699f92d2aa6c4fef61fa9baf856dc0ab9fed92049474c7c3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12581 11236 bytes

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