Malicious PDF — malware analysis report

Static analysis result for SHA-256 535db83faeae69a7…

MALICIOUS

PDF

74.8 KB Created: 2021-04-05 00:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5d2e2ef4cff45f2ef1508b94f99214d4 SHA-1: 18f6169f287477b15943a9ea78172980bfc0598e SHA-256: 535db83faeae69a7e2326af89b0f0f00477674c8377b438296daa26ad4f212a2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9991

Heuristics 6

  • 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 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://nipisod.ru/strik?utm_term=what+is+the+best+way+to+clean+a+textured+ceiling PDF link annotation
    • http://cashbackmoney.info/ejercicios_de_vectores_fisica_1_bach526hj.pdfIn PDF document text
    • http://fruitslope.online/chitta_ve_full_video_song3x6z7.pdfIn PDF document text
    • http://esmoney.site/feranenatabanisulej11i9a.pdfIn PDF document text
    • http://it50save.info/jizobijej19d3o.pdfIn PDF document text
    • https://gadonivoxe.weebly.com/uploads/1/3/5/3/135331758/danipumosikavebusule.pdfIn PDF document text
    • http://bbcua.site/975835453115hxqb.pdfIn PDF document text
    • https://juduloto.weebly.com/uploads/1/3/5/3/135323899/abefa491a7.pdfIn PDF document text
    • http://coins24h.com/tedodifidgppo.pdfIn PDF document text
    • http://losqutoq.online/405774777203w9w5.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/xeriwe.pdfIn PDF document text
    • https://jawavovamote.weebly.com/uploads/1/3/4/7/134748122/pekotesu_wonetev_raladudobivi_sagesudinilaxeg.pdfIn PDF document text
    • http://hookup154.online/33482907508gbngs.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/fd731e60-12a2-41d7-b248-5e5f44cff0ba/keto_frozen_meals_amazon.pdfIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_8e1dab8f14f7430fa7a22dfdfd40fad8.pdf?index=trueIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_db3690218aea4ffcb388d83f9eef6bc7.pdf?index=trueIn PDF document text
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_98f5695fbf8c454493e7d8a38c9869c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a53490b-a6c3-412b-8510-cbf679f7bc7b/24682734743.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a21b83-7acf-4d97-ab60-0d5a12651814/mockingjay_book_movie_differences.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/683f0717-a693-45d8-a498-f37bcefa0823/mazimudakopijapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3012c4d-369d-4493-a311-86d0fff002e4/2015_ap_statistics_multiple_choice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca0d0b44-2bd9-479e-be19-a3d9d1d138ab/download_tcp_ip_protocol_driver_for_windows_8.pdfIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_07359027965d4fe18e07acdfb61d0a89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/478c7e81-4536-4360-9efb-b927e4b84b89/larson_calculus_10th_edition_slader.pdfIn PDF document text
    • https://e905e09d-7ddd-4aab-833c-73500e817873.filesusr.com/ugd/f4c08b_b8690f73d5104ea199c81714e850a549.pdf?index=trueIn 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_off0000e777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE777 5616 bytes
SHA-256: d417d796dcddb0d9520b4f70a9fd5a5fb28f0f361f7c83d4d7c779cb8568ed47
font_01_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 10244 bytes
SHA-256: 6fe98143451f827313e434ea9d76f9eed30ae81039ce13569d1c5c2afcc1808e