Malicious PDF — malware analysis report

Static analysis result for SHA-256 66242b268080aa12…

MALICIOUS

PDF

73.3 KB Created: 2021-01-24 21:50:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bcb15c6bf573ad3911bd3b01afbb3fe5 SHA-1: 293c6f00c8f276b8817552f6635a4ab015663b6d SHA-256: 66242b268080aa125da5bb65e91567aee92a1015dd21b1b90a37d5d5e09e6c52
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to disposable domains and known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=two+old+goats+lotion In PDF document text
    • http://kernig.pro/mi_music_player_apk_latest_version_downloadr2awt.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/head_soccer_2019_champions_leaguetsiyl.pdfIn PDF document text
    • http://natikolom.site/cabela_s_big_game_hunter_downloadzket9.pdfIn PDF document text
    • http://creditstar-kabinet.com/xukodapojirfj6v.pdfIn PDF document text
    • http://netlysy.online/moto_vlog_brasil_2_apk_download6vfre.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_5fe74f3e7a8c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401994/normal_5feea7b3f24a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486763/normal_5ff5e21ecb667.pdfIn PDF document text
    • http://liolika-rsya.ru/dwight_yoakam_suspicious_minds_chordsh6qng.pdfIn PDF document text
    • http://muzoc.xyz/popasifufeweravoma6n.pdfIn PDF document text
    • http://kind-insta.site/kobodivuvejujobadikitifqfkg.pdfIn PDF document text
    • http://creditactive.info/junavuvekogapub2x42.pdfIn PDF document text
    • http://the-job.ru/write_notepads_onlineg1fwo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/aphex_twin_avril_14_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/amazing_grace_piano_sheet_music_john_newton.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/current_affairs_adda247.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_off0000e33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33D 4940 bytes
SHA-256: ea8e5e17ba34f9226e21730c67d7a5497592731b9bd41e9022dd80f2f0539c78
font_01_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 10616 bytes
SHA-256: a536ee165cab6c90af0019c44eba848891a6fae2c18381e99a730463c4d8a412