Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c47658b06f85d9…

MALICIOUS

PDF

69.5 KB Created: 2021-03-23 12:14:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d189920d68ff84cb7674c7d94c985bce SHA-1: e730643adf468b4eda7206d2e855f7bffbe8644d SHA-256: 64c47658b06f85d999dc911d6602aec71ab1ba51a57e91f75829112cd74033b1
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one primary link pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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://soxebez.ru/123?utm_term=big+ideas+math+california+course+2+answers
    • https://cdn.sqhk.co/fokatekox/a3Rqijh/ball_bash_stern.pdf
    • https://cdn.sqhk.co/minamojazi/8hdTuid/zona_top_up_game_murah_ml.pdf
    • https://cdn.sqhk.co/lotidonita/smCgfIV/2nd_grade_writing_process_lesson_plan.pdf
    • https://sovanomi.weebly.com/uploads/1/3/5/3/135337195/volobuzigi.pdf
    • https://cdn.sqhk.co/zoboxoba/iyhbhae/perebamelare.pdf
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/6209004.pdf
    • http://100p-f.ru/sowebenisalvtxpk.pdf
    • http://mastericy-chistoty.ru/7209960831698317.pdf
    • https://vososodimeditu.weebly.com/uploads/1/3/4/5/134599865/1046078.pdf
    • https://cdn.sqhk.co/povewepalu/0jazw0f/sakelixe.pdf
    • https://cdn.sqhk.co/tijinujul/gjcLgnz/is_there_a_facebook_lite_app_for_iphone.pdf
    • http://max-lifting.store/sinavox4rcef.pdf
    • http://storezone.info/scan_sheet_music_to_midi_freeddb2u.pdf
    • https://vobikonim.weebly.com/uploads/1/3/5/3/135390296/gupenawimisojobi.pdf
    • https://cdn.sqhk.co/mikevoponage/hbhgQlN/car_racing_games_for_pc_free_download_2020.pdf
    • https://vixananuxa.weebly.com/uploads/1/3/4/8/134881407/zimuwuzirimifipo.pdf
    • http://zuvels.xyz/resoluwijexefibesuzixuse7gacu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/babetafaperaxov/nisajevaveti.pdf
    • https://s3.amazonaws.com/rolefosiju/kegozevupe.pdf
    • https://s3.amazonaws.com/tuzakifezara/vcds_12._12_for_mac.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_off0000cfee.bin
85288faba675fd24efa91f5fd7107471a16ae79e86121cc63246749944119633		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEE 5708 bytes
font_01_sfnt_off0000e347.bin
eddaa0baadae7287e8b52842ed3bf4fb6c1bbb3fc8b82e63c40eb4d33d425142		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 10380 bytes

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