Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f3b4c749910655…

MALICIOUS

PDF

73.1 KB Created: 2021-03-25 14:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2e8f4a7127e459e297c4b5da8c51c606 SHA-1: 948d13ddc4940c4926b4609050a93942947fc41e SHA-256: 16f3b4c7499106559458ba292ed97a4df26ac5e98d18a5b8034249a61371a1ee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=how+to+pair+auvio+speaker PDF link annotation
    • https://rexekimat.weebly.com/uploads/1/3/4/0/134017736/8213654.pdfIn PDF document text
    • http://heleogose.online/powerful_verbs_worksheet_6th_graderv06z.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzezajolu/ARuih0a/runescape_haunted_house.pdfIn PDF document text
    • http://eurozone.pro/daxosotoloradiz4vqz2.pdfIn PDF document text
    • http://ttttrrrr.space/zetumopepifatiselu3h6kf.pdfIn PDF document text
    • https://pegufozexak.weebly.com/uploads/1/3/5/3/135317465/bifisagenowag.pdfIn PDF document text
    • http://reduslim-buy.site/61694533293ojem8.pdfIn PDF document text
    • http://urolog.xyz/eddie_bauer_baby_sling_hip_carrier_instructions0mcy3.pdfIn PDF document text
    • http://thesimplycompleteseries.com/fox_reporter_aishah_hasnie9mgb3.pdfIn PDF document text
    • https://vatubovelogised.weebly.com/uploads/1/3/4/3/134375195/9776280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460266/normal_6054c9296d5a5.pdfIn PDF document text
    • http://eglo.club/756709755871v3n2.pdfIn PDF document text
    • https://cdn.sqhk.co/pemoxeriko/AhhbS0s/hard_rock_music_bands_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_603b8e5a2258a.pdfIn PDF document text
    • http://bodyita.space/19212230457o3gu0.pdfIn PDF document text
    • https://fupixadig.weebly.com/uploads/1/3/4/0/134096542/nogebevenu-rigex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_6034220017a61.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/jf3hghe/3147400965.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418166/normal_60077424df150.pdfIn PDF document text
    • http://zoom-omsk.ru/the_humans_stephen_karam_scriptw370w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425501/normal_5ffc012eea298.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14B 4956 bytes
SHA-256: 08e1d115e71380ea2efad129641907ab1b982812ec133e4cacf094be9135ebb9
font_01_sfnt_off0000f24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 10764 bytes
SHA-256: 99f6bc26a0874a021102baa85df1a276ef2e316fec5342b703af4748061cfb73

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