Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99fb84bb8ec11fd…

MALICIOUS

PDF

79.2 KB Created: 2021-05-12 07:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7d4a9890b008d96f044e9ac0fbbafc06 SHA-1: b61c16fb83d5d1eed210ac443abde83c99893fd4 SHA-256: a99fb84bb8ec11fd35206703adbbf0dfa19624c4aab453a6e51045b060a2d93f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://maypoin.ru/strik?utm_term=simple+piano+sheet+music+for+beginners PDF link annotation
    • http://budokudepa.scienceontheweb.net/7073975506.pdfIn PDF document text
    • https://cdn.sqhk.co/nisonodoweb/hjcdbNh/cessna_caravan_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/revinoxu/ghvpkhg/60297927858.pdfIn PDF document text
    • http://dududuw.mypressonline.com/how_to_set_the_citizen_eco-drive_skyhawk_watch.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/is_there_a_killing_floor_3.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/hayward_pool_chlorinator_wrench.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/3sAjfYO/44651459439.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/76fa1619-f7a1-4905-8634-f14382a66912/46796310234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/077182d0-bf85-4479-a2b2-8e7d83364e2c/liftmaster_8500_troubleshooting_codes.pdfIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/aldi_application_2020.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_daea78605df141b0956667a4a29f3a77.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80fa1ec6-c17a-4330-927f-d6b923d808f6/puwivaj.pdfIn PDF document text
    • http://zitulogakapede.myartsonline.com/pendidikan_kewarganegaraan_di_amerika_serikat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32ad49a9-fa47-4eae-9049-e4bbed7bdbf5/trx_exercise_list.pdfIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_ae593665d98645c68cbb9e28c51a896e.pdf?index=trueIn PDF document text
    • http://xejobutek.onlinewebshop.net/amulet_book_7_download_free.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_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 5672 bytes
SHA-256: 9a52edad1c201f745499b3feaaf2ec34abe38e597926b3e3ac57415228fd1e1a
font_01_sfnt_off00010a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A32 11080 bytes
SHA-256: a26483d0b82e47ad0e32a70c684424a6e5d67e5f494f7175e1a7fe26e4938a19

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