Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9c47b3014e1777…

MALICIOUS

PDF

80.0 KB Created: 2021-01-28 16:24:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7e77b483e0a7b94fae535e0421f5aa6 SHA-1: 5e01d328f1d4b089b10c6b08de114662e157198b SHA-256: 3e9c47b3014e1777204ab8e1e2a7f91f111a5769373c4cf6542e66485d07f6ee
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to disposable domains and are likely used to host malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as phishing and a trojan. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the use of link farms for distributing malware, likely disguised as legitimate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/123?utm_term=craftsy+coupon+2018
    • http://proba7.xyz/camera_app_for_laptop_windows_1045y4h.pdf
    • http://bluhgang.best/20230753278ikq7n.pdf
    • http://alkim.xyz/705352604649w87h.pdf
    • http://lasns.fun/vefoxusudu66m7w.pdf
    • http://pochta-24.cc/robot_carnival_cloud4wfc6.pdf
    • http://interbankdigital.com/9720063711200rp.pdf
    • https://gisixumaxen.weebly.com/uploads/1/3/1/8/131856636/cf722bb0a52473b.pdf
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/5982842.pdf
    • http://blubadgehelp.net/671261312021bfs2.pdf
    • http://makamar.online/tumblr_aesthetics_pictures1kuqt.pdf
    • https://lozofuxoxezutuw.weebly.com/uploads/1/3/5/3/135303337/51ff8a9.pdf
    • https://mebifexet.weebly.com/uploads/1/3/1/3/131381374/wilorufusuni.pdf
    • http://triple-doska5.club/aceable_parent_taught_drivers_ed_reviewsx4asf.pdf
    • http://stikc.xyz/gaderulitikowudebojilektmvo4.pdf
    • http://beremoter.online/halloween_sniper_scary_zombies_mod_apkjn2p3.pdf
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/186886d061.pdf
    • http://puruzil.iblogger.org/44421886421.pdf
    • http://laura-egorova.ru/7391999794391v3f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://worubag.epizy.com/2015_schedule_a_itemized_deductions_worksheet.pdf
    • http://fepadegan.epizy.com/97805876659.pdf
    • https://s3.amazonaws.com/kesumasaka/kobe_earthquake_news_report.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_off0000f9ee.bin
c806da932cc1d4805bb5a4ff21aba2757bda496760f55337e05a71efb5e4c5a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EE 5504 bytes
font_01_sfnt_off00010cc0.bin
59e439266aa2a0873a44eaec717560cd0c578e78585b16c0b2e7e56b20895201		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 11180 bytes

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