Malicious PDF — malware analysis report

Static analysis result for SHA-256 46777fd55f88abec…

MALICIOUS

PDF

77.4 KB Created: 2021-03-17 09:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 137caaa03cea6a3256889818fb162c43 SHA-1: 5cfbabc417b2293975f291d9c66d35bd3101a3cc SHA-256: 46777fd55f88abec5f4915c6afac2a7596bde7e2f85d3dafa7b39f7cea5fdfe8
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 0.9997

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://druttle.ru/award?keyword=psychology+of+color+in+architecture+pdf PDF link annotation
    • https://cdn.sqhk.co/fikalibumi/iicjd05/davemofelo.pdfIn PDF document text
    • https://lataladegizozav.weebly.com/uploads/1/3/4/6/134685495/6ef35e0f6.pdfIn PDF document text
    • https://cdn.sqhk.co/vutazekerubu/9khdafK/axis_360_books_to_kindle.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/gpiergi/flight_arrival_check_gatwick.pdfIn PDF document text
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/4504318.pdfIn PDF document text
    • https://cdn.sqhk.co/nilamemiw/0MjcTje/91442474661.pdfIn PDF document text
    • https://nogudoge.weebly.com/uploads/1/3/4/0/134017621/fasolozutoseram.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuwegijelo/BkRhcic/8676761016.pdfIn PDF document text
    • https://vutepunuvo.weebly.com/uploads/1/3/1/6/131637517/3304481.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/cifhhgd/59814807956.pdfIn PDF document text
    • https://cdn.sqhk.co/vovigewuva/hjgfjgx/edhesive_coding_answers.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/4be264e8-d3c3-4d4d-a41a-fa9e3a58c4a4/how_much_does_it_cost_to_service_a_toyota_prius.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20c86b58-45f1-4aa2-97e6-a9b52118c3ef/polo_ralph_lauren_promo_code_2019.pdfIn PDF document text
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_c2b09c77529947e8bfd89ce77563356a.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_d80322a478c94f648e2186909692bb3d.pdf?index=trueIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_589d3314390d4946bca41efaad1dcf95.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57835d15-1902-4f9d-880a-0a45751f6e12/hitchhikers_guide_to_the_galaxy_movie_online_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/340ecbbf-9437-4be2-9e4f-def5af7d7f80/bedivaxumo.pdfIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_19570a9a05b24524a4e21be459350f5d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c89cff9-d11e-49d9-9a5d-26bc900ca574/went_down_the_rabbit_hole_meaning.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_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 5520 bytes
SHA-256: 5dc1dbf8d0546fa0c2d93ffc2a8d231c7cf4f3ddbe04f9fae9121ab6bb935362
font_01_sfnt_off000102f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 10896 bytes
SHA-256: 789b09e063dc9c8076c2cb3fbda35533a9badca7b360238530484b08f2550f41