Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6fdc686b636da9…

MALICIOUS

PDF

75.0 KB Created: 2021-02-28 05:36:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 767600586017a8f30e7af020deb53d0b SHA-1: 7ddd8bc49aa826652ec1bd0ec389db340e3d769b SHA-256: fe6fdc686b636da97b1b083f1734fdfc2a5f5673014ac9b74f365e0d2e8b303f
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URIs, with one pointing to a suspicious domain ('midufefew.ru') that is likely used for phishing or to host a secondary payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a malicious attempt to obscure the true destination through a network of disposable domains.

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://midufefew.ru/award?keyword=the+expanse+season+4+new+characters PDF link annotation
    • https://vatewiwep.weebly.com/uploads/1/3/4/4/134482367/kuvonejuwim.pdfIn PDF document text
    • http://nakozek.mypressonline.com/horus_heresy_siege_of_terra_sol_system_map.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/r_programming_for_data_science_amazon.pdfIn PDF document text
    • http://timogefubor.22web.org/70944417424.pdfIn PDF document text
    • https://kuzapulekoxiror.weebly.com/uploads/1/3/2/6/132681507/8790632.pdfIn PDF document text
    • https://gumevimarijefa.weebly.com/uploads/1/3/1/0/131071167/d50167ce.pdfIn PDF document text
    • https://cdn.sqhk.co/nuditufu/baijffI/84444792275.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/libro_gramatica_y_ortografia_basica_de_la_lengua_espaola.pdfIn PDF document text
    • https://cdn.sqhk.co/ritafase/T3igNwN/country_life_harvest_day_mod_apk_2.pdfIn PDF document text
    • https://cdn.sqhk.co/tewokozogop/ZKjdhbn/download_wallpaper_pes_2020_hd.pdfIn PDF document text
    • http://kegujusotuk.iblogger.org/5410526291.pdfIn PDF document text
    • https://lepenenaxagonu.weebly.com/uploads/1/3/0/7/130739126/nolusilonitu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://voputujewijozej.rf.gd/nutrition_careers_salary.pdfIn PDF document text
    • http://fujebudavitasoz.epizy.com/epl_transfer_news_bbc_report.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/kuwonudizinexowopon.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/best_lg_tracfone_2020.pdfIn PDF document text
    • http://nokumew.epizy.com/tixepaxowoku.pdfIn PDF document text
    • http://wumoxafu.epizy.com/android_snackbar_with_dismiss_button.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_off0000e88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 5184 bytes
SHA-256: 7505745db9459bbef919d8d6806888ab91f2aa28870a7fa57d4712c709a886c7
font_01_sfnt_off0000fa47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 10756 bytes
SHA-256: 20ebe22549a98e3b080d5e4b6f7d718793d599ebf7fb474dacef29d70d463233

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