Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a79bf6fc3037ffe…

MALICIOUS

PDF

72.7 KB Created: 2021-02-13 10:20:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0e6e682d9bc61a9b0f721336fd0bd850 SHA-1: 7387d42d30cfdb24e0127c7946215b2b7d7b9aea SHA-256: 8a79bf6fc3037ffeddf984e032c8052a0a6a4117e3aef05741bdcf081a654cad
134 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URL and document body suggest a lure for downloading an application, likely malicious. The presence of external URIs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/aws?utm_term=jio+phone+call+recording+apk PDF link annotation
    • https://cdn.sqhk.co/fusaduxuw/v9xiijt/nails_and_spa_merrillville.pdfIn PDF document text
    • https://cdn.sqhk.co/gavoduse/gc1gcgi/abc_song_in_spanish_with_dog.pdfIn PDF document text
    • http://zakoroxani.22web.org/whatsapp_app_status_saver.pdfIn PDF document text
    • http://dabuxupufudina.22web.org/sapipikikuneravexaf.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/Xjaqia5/7165499301.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/jihqoH8/nigosolidi.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/gejeidO/72269925972.pdfIn PDF document text
    • http://tawilexupo.iblogger.org/converter_avi_to_mp4_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/egfgfgj/brawl_master_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/zanemulazif/KHrdjes/benji_bananas_hack_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nodewanase/s6hijeP/jesuvaxaxezunakipedewu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viganoxoloni.rf.gd/efectum_pro_apk_no_watermark.pdfIn PDF document text
    • http://molulig.epizy.com/luigi_s_mansion_theme_sheet_music.pdfIn PDF document text
    • http://wexoloxi.rf.gd/mega_filmes_hd_2._0_apk_atualizado.pdfIn PDF document text
    • http://lunowakaneruf.rf.gd/obd2_android_app_open_source.pdfIn PDF document text
    • http://solazagu.epizy.com/cars_movie_theme_song.pdfIn PDF document text
    • http://xibogowidam.epizy.com/kerrville_plane_crash_ntsb_report.pdfIn PDF document text
    • http://muwadobekele.rf.gd/31323984574.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_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 5208 bytes
SHA-256: 38daf9eebdc931ddbc2a2c123846912a3961d3e79862ea3bc5571c1a49dbfe1a
font_01_sfnt_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 10760 bytes
SHA-256: 2bf0f954444fd0b3389900209d4179c48250ac26e049cb0cb80ec1bcac1c322f

Open this report in the interactive analyzer, or submit your own file for analysis.