Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0076fbb1cdaa14e…

MALICIOUS

PDF

73.9 KB Created: 2021-03-08 13:14:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a5eb7dc627015342749c23b4af7ea0cc SHA-1: dfc4d5a5e28cac729d02e2e041c7c256b97119d0 SHA-256: a0076fbb1cdaa14ec2d5eeb61bf202f489ad113ba2431497c7610d59b6a92604
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one pointing to 'crophysi.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://crophysi.ru/award?keyword=personal+statement+structure+pdf PDF link annotation
    • http://ig-copyrightviolation.com/darajabolazufajelnjbh1.pdfIn PDF document text
    • http://igme.site/what_are_the_capabilities_of_data_mining_toolsnko6z.pdfIn PDF document text
    • https://cdn.sqhk.co/fefavezevir/iEa5eih/sling_tv_channels_in_my_area.pdfIn PDF document text
    • http://gotiwokina.iblogger.org/11823611009.pdfIn PDF document text
    • https://cdn.sqhk.co/rutesawir/rKheyje/41952195114.pdfIn PDF document text
    • https://cdn.sqhk.co/rojarimeg/5N5eHie/modern_combat_5_esports_fps_pc_hack.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/kalanejaxutilif/jilotejerox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6513a12d-7258-461c-acb4-16aec45ddd57/53447473923.pdfIn PDF document text
    • http://tofoxofifu.rf.gd/boy_scout_merit_badge_workbook_answers.pdfIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_fa03d911ca764d0db3c5e7e635a1d381.pdf?index=trueIn PDF document text
    • http://renirujetumofid.epizy.com/chalte_chalte_song_ming._se.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ef3dd52-3612-4ad8-a6d9-2dd177fea6f9/gigovumiwasutorij.pdfIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_392bafbe05cb456d9cf8a48a48b02d05.pdf?index=trueIn PDF document text
    • http://godotarubaxo.rf.gd/mla_bibliography_format_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/906aee2b-28a0-432d-a1bb-b8e84999c106/80905622811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7922bf6a-4634-4cb8-85e9-5da86e9130d8/85450248939.pdfIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_bb8def766c6548878f2e6d1f868ff762.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/gireri.pdfIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_46635d242c5f42948ad8181401df3d06.pdf?index=trueIn PDF document text
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_b8693119a60c48e789d692e51a18016a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/962d50e6-7d0a-4cfe-85a9-0a58dd618003/56752869308.pdfIn PDF document text
    • http://jufulejilola.epizy.com/2912517404.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_off0000e507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE507 5300 bytes
SHA-256: b933527077e669a68dde322ac53824697039be256618498a106eb5c9083aa9eb
font_01_sfnt_off0000f6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F8 10240 bytes
SHA-256: b43f7e8fbcf81526fce8cd0e139a40a77ed384dae353d9804460253d89126058

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