Malicious PDF — malware analysis report

Static analysis result for SHA-256 69cc9d5f92010e45…

MALICIOUS

PDF

81.0 KB Created: 2021-03-31 05:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5d7696d0e7ddcc4548d1ea59d3ced070 SHA-1: c4119e178ca8a6ae4239fbd0171428b96b292520 SHA-256: 69cc9d5f92010e45596adeaa7ab6871ae12d4ba0f8a8720057213523864191fe
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to disposable hosting and are likely part of a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to lead users to compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/strik?utm_term=how+to+learn+siemens+plc+programming PDF link annotation
    • http://baditunabupiru.mywebcommunity.org/inflammatory_bowel_disease_journal.pdfIn PDF document text
    • http://xajavawinereko.mywebcommunity.org/cuento_caperucita_roja_con_imagenes.pdfIn PDF document text
    • http://tunabamilusi.mypressonline.com/mercado_de_valores_definicion.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/X2hhgdF/monster_hunter_stories_ride_on_voice_actors.pdfIn PDF document text
    • https://cdn.sqhk.co/burajugi/iiiPhip/lobamojokejujolenu.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/43284199187.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/693c56ec-953f-442b-a850-ddad5566966c/37703545000.pdfIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_460d2ef8750842e8986fa3cebcf1182b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fadedosi/bareilly_ki_barfi_hd_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/72573911528.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/brewers_association_beer_style_guidelines.pdfIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_f43b536f76b540cc8cfdf6882eded3ab.pdf?index=trueIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_6bd7144b71f14f99b4edc3e296ef080a.pdf?index=trueIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_7cb091b73a9143319203f12450a4ce24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/762f30ef-ae32-41b7-8e3f-9a9149c2447b/surefajimezo.pdfIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_09faa0d041564afd981ed96420906569.pdf?index=trueIn PDF document text
    • https://8aa13d94-a051-4bfa-911d-5e7c2f772018.filesusr.com/ugd/382cc4_af2c62fd884d479cadf8a381bc35b2ad.pdf?index=trueIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_84a324be7ce34cb8a5e770b711ae79e7.pdf?index=trueIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_7401d0b32cb74e0eaec2bcf52dec4024.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5246fc8e-b9da-43dd-9d00-6feaec50b764/introduction_to_applied_linguistics_schmitt.pdfIn PDF document text
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_22971f67e777439d8e7103377451a229.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9680255f-4dcb-4314-9a88-9ec5429d7aa7/excellent_gifts_for_sister.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_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 5304 bytes
SHA-256: 2790c4158e83694f8da1f93d746f5cd469c4aacf728a95952cba3ba1ba35f8e6
font_01_sfnt_off00010d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D74 11464 bytes
SHA-256: df2e479c30988fb17d6ca2e125e631e80e2290d74896f4cef407d491cf850521

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