Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cf8af306ef413e…

MALICIOUS

PDF

82.1 KB Created: 2021-04-02 02:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 45966311384a12fd6e73f237fa774833 SHA-1: 21e3eca366dd4099725d8f9f97cf13998f591d10 SHA-256: 85cf8af306ef413ee492d91f87dd9156da3f52e2351f8d62cb8096994a84fd8a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, which are indicative of a phishing or link farm attack. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to malicious websites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/award?keyword=biology+class+11+ncert+chapter+1+pdf PDF link annotation
    • https://cdn.sqhk.co/definuseju/mROAhgN/the_maze_runner_book_review_goodreads.pdfIn PDF document text
    • http://fapseo.ru/49850793343w6q4o.pdfIn PDF document text
    • http://grantmedica.ru/signals_and_systemsn269n.pdfIn PDF document text
    • http://nonretloli.site/tunixetosamelunamufekojohdpnf.pdfIn PDF document text
    • http://getliterate.online/cover_letter_template_for_nursing_studenti4ctt.pdfIn PDF document text
    • http://poopo.ru/cambridge_english_proficiency_2_answerse2nvu.pdfIn PDF document text
    • http://english-10.site/when_is_season_4_of_a_series_of_unfortunate_events_coming_to_netflix61dd9.pdfIn PDF document text
    • https://pemiliruvobavex.weebly.com/uploads/1/3/0/7/130739389/1698674.pdfIn PDF document text
    • https://fometixivoros.weebly.com/uploads/1/3/1/6/131637143/puneropotelovapan.pdfIn PDF document text
    • http://grigolia-studio.ru/591106406290o8hk.pdfIn PDF document text
    • https://vokarojunez.weebly.com/uploads/1/3/2/6/132696330/zodatozir_xivogotiv_nejivameruvi_nomax.pdfIn PDF document text
    • http://autolombardpro.ru/mozafiloresu171z.pdfIn PDF document text
    • https://dafelubuvotaxid.weebly.com/uploads/1/3/4/7/134753950/9475f8af7b15.pdfIn PDF document text
    • https://sixoribena.weebly.com/uploads/1/3/4/8/134848884/momobokikesemozefali.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/hmaKw83/29414061806.pdfIn PDF document text
    • https://kotezoxeruv.weebly.com/uploads/1/3/5/3/135345651/e4214d9f3c.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/g6ifljj/8900674418.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/puvovexe.pdfIn PDF document text
    • https://siximegam.weebly.com/uploads/1/3/1/4/131453251/9509724.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7923c4f9-8955-4330-9141-9f13ae60e603/clifford_geertz_thick_description_toward_an_interpretive_theory_of_culture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41fedc4a-6899-4890-abef-d576775023d5/stealth_cam_cellular_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac01df98-d537-4dcf-84cb-9dfa8600c9a1/97788356980.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca249a35-dcc3-4c81-bb65-53bcb614995d/fidejikinukomilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b8d0b2b-6534-4de0-901a-478ef2a42c88/jewiluleliloreruriwelir.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_off000101c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C6 5620 bytes
SHA-256: 02859ed9197b243ba647a50c04caa989b46d5b570ad6d7a32400b7d1032f79b5
font_01_sfnt_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 11176 bytes
SHA-256: 4062751b6740ca5a32692c1671c8ef621e13d5be7a4eb69d0ed4dde503ab76ee

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