Malicious PDF — malware analysis report

Static analysis result for SHA-256 4523b3ea3407a95e…

MALICIOUS

PDF

100.7 KB Created: 2021-03-27 15:19:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0706982bf5c495a1bd5dfd232b705c72 SHA-1: 764f8f829ef4248a7efbed42b00b9ef50e68a040 SHA-256: 4523b3ea3407a95ea1008add4e286358d574ef7902fce09d4bf34a3930f659c9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and potentially a phishing or trojan delivery mechanism. It contains numerous external links, with one prominent URL pointing to 'jumiwimov.ru', suggesting a link farm or phishing attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of embedded URIs and the overall heuristic profile indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=pyramide+des+besoins+de+maslow+pdf
    • http://vitofemegawe.getenjoyment.net/how_to_reset_casio_solar_watch.pdf
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/4dc8c5e7c.pdf
    • https://cdn-cms.f-static.net/uploads/4501962/normal_60394dcf4a062.pdf
    • http://nogefoxezegu.22web.org/lovixusubete.pdf
    • http://lenugaguv.medianewsonline.com/what_is_the_poem_the_raven_all_about.pdf
    • https://cdn-cms.f-static.net/uploads/4418166/normal_5fe68cfb7e970.pdf
    • https://cdn-cms.f-static.net/uploads/4447631/normal_5fd10bb139d5c.pdf
    • http://ragesedanem.iblogger.org/vekawamuxixa.pdf
    • https://jitotapo.weebly.com/uploads/1/3/5/3/135314003/948178c6eb0.pdf
    • https://kugijibogizupe.weebly.com/uploads/1/3/6/0/136055246/gavuvavi_disogogudonodur_wakixufuja_difej.pdf
    • https://wikazire.weebly.com/uploads/1/3/0/9/130968935/3219204.pdf
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/5710473.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_3d8b837c6bea49208e9ca48c904f68d3.pdf?index=true
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_b8b25bb5242d48fe8e413410f1141049.pdf?index=true
    • https://uploads.strikinglycdn.com/files/52f24756-5003-48ac-afaa-6a8078d100a7/high_school_musical_jr_script_kelsi.pdf
    • https://uploads.strikinglycdn.com/files/2567db5c-dc06-4cac-9163-5897922685aa/dirt_devil_power_stick_sd12530_cordless.pdf
    • http://pugetuwozijeso.rf.gd/najopevolupokabenuzogipa.pdf
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_9db030bc6ec04c748068acbf08be17d6.pdf?index=true
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_5d2e613dbde143afbc36d9d43cd67d93.pdf?index=true
    • http://vusurides.rf.gd/39164454177.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c94.bin
94ca5228de1af2930406a6825a617e44aff31b7fc5833ead7a2930ed43156b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C94 5232 bytes
font_01_sfnt_off00014e45.bin
e5a46351082ad4fbe12eb809a1fc29c50b1ea610b7ec1bb358e83cc15c305427
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E45 12516 bytes
font_02_sfnt_off00017551.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x17551 4324 bytes