Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d31038e3c4c354…

MALICIOUS

PDF

87.9 KB Created: 2021-03-05 21:21:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6246e11c262e139068683774c11cf7e6 SHA-1: 97e1d433128be1add94900ec5357a83c7db68de9 SHA-256: c8d31038e3c4c354da61a8baa1b2acbfa0c335d0711f586003bcc667e2b30405
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 0.9993

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://lozipotod.ru/strik?utm_term=hp+color+laserjet+enterprise+cp4525+printer+series+driver PDF link annotation
    • http://fisifur.iblogger.org/child_and_adolescent_development_philippines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_6021cf142e2d5.pdfIn PDF document text
    • http://gijutudubesakuz.iblogger.org/62055190184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_600e5f18a7a7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458628/normal_6041de22c3e5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453888/normal_5fe58edb188ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369782/normal_5ff05b880d6cd.pdfIn PDF document text
    • http://xupenirulavep.iblogger.org/smart_watch_sim_card_android.pdfIn PDF document text
    • http://vevolim.iblogger.org/top_bollywood_emotional_songs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409421/normal_5ff80f515880a.pdfIn PDF document text
    • http://gekewemujokode.22web.org/complete_university_guide_league_tables_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418984/normal_6012f89f228a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454303/normal_6013769e6da05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://filivuso.rf.gd/pikowajivutedetada.pdfIn PDF document text
    • http://gatakokuto.rf.gd/babbu_maan_image.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/astro_kpop_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/42544208231.pdfIn PDF document text
    • http://kopuperoki.epizy.com/fefevus.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/xuzofegifoxidineko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7372d0dc-18ef-43c1-b668-c916a0fb45d1/vukesafufusezujutikuvofop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e763b685-57d9-4fa7-b943-35fe083635d3/44782418714.pdfIn PDF document text
    • http://fabonek.rf.gd/guarantors_letter_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01ba0046-cb7f-4d8f-aeb7-34cb009009c5/20186610338.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_off00011af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 5508 bytes
SHA-256: a1ebcdee23a9ccf3c983ac69f478575853aa978e8c50209826b01e8a0e6d90c0
font_01_sfnt_off00012dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD5 10552 bytes
SHA-256: 505225b29b2ad87f7db50d5091f48dd97c999bd9dd1c268727ea04c2ea3ec644

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