Malicious PDF — malware analysis report

Static analysis result for SHA-256 d660b59a41e1be0b…

MALICIOUS

PDF

74.8 KB Created: 2021-02-24 04:01:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ea7ebe21892aa1aefb7eeafdbc744f58 SHA-1: d580cbee0d68fc088acbba053c1e8fabc57b6cf9 SHA-256: d660b59a41e1be0b65138ee5f19d3f7971e10d9792b81fd10a21e24e8c473018
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which point to disposable domains and known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was heavily obfuscated, making a precise determination of the payload difficult.

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://crophysi.ru/123?utm_term=harry+potter+cast+voldemort+side In PDF document text
    • http://fabermanufacture.ru/ball_resurrection_apk_modx13vt.pdfIn PDF document text
    • http://creditscorerepair.info/kutirugamiwawowumitozj4hr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388407/normal_5fde9fba8f2d7.pdfIn PDF document text
    • http://legendbilisim.com/11-22-63_differences_between_book_and_moviei8ez0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473616/normal_600befe90d141.pdfIn PDF document text
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/8735294.pdfIn PDF document text
    • https://pexajutamog.weebly.com/uploads/1/3/4/7/134759810/vepizajuwofamagiziga.pdfIn PDF document text
    • http://idealicaitalia-oficial.site/how_to_send_videos_on_discordftijb.pdfIn PDF document text
    • http://ayazshabutdinov.club/452579052101wt1o.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/kunetapug-fevoseja-takujaxal.pdfIn PDF document text
    • https://wikefazopikevi.weebly.com/uploads/1/3/4/7/134715570/mezelurovoganid.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/metubevozisul/feposivazifel.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/sag_modified_low_budget_rates.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_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 5344 bytes
SHA-256: caca97d1c29e5b6c006e4a1e32bd7c1e5afcafceff8d513034c4cad8cb0e7f6f
font_01_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 10276 bytes
SHA-256: 02340ebe530d1156e35273368250c08601ba921ad03460b2351419e29ecbeed2

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