Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fea9ec0c54e3a28…

MALICIOUS

PDF

67.7 KB Created: 2021-04-03 11:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6a3587fd75dacd1e8cbd24aabd44de44 SHA-1: d71774b583a33dd7cb05d56b61b5fb908d67d084 SHA-256: 5fea9ec0c54e3a2820c0dce4806e0810b8ac017fd307914cce0b087b0d657192
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, likely delivered via spearphishing.

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://fokemale.ru/123?utm_term=future+continuous+tense+worksheets+with+answers+pdf PDF link annotation
    • http://polfact.site/baby_bjorn_bouncer_mesh_reviewxlgo0.pdfIn PDF document text
    • https://zimolitavok.weebly.com/uploads/1/3/1/8/131856331/24bc514e5.pdfIn PDF document text
    • https://likuwiwekadu.weebly.com/uploads/1/3/1/8/131857000/04507.pdfIn PDF document text
    • http://urolog.xyz/snapseed_app_for_iphone_7up3lx.pdfIn PDF document text
    • https://gunobapeve.weebly.com/uploads/1/3/4/7/134706327/kixukularuzezugozemu.pdfIn PDF document text
    • http://reduslimitalia.site/fair_mormon_pearl_of_great_pricewf2dx.pdfIn PDF document text
    • http://canonsburglake.org/sql_server_express_2012_with_tools2i2w6.pdfIn PDF document text
    • https://wepopoxewu.weebly.com/uploads/1/3/1/1/131164118/rizomotimasenufe.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/809a0425-e04c-448d-a631-8700a034cd6a/nlt_bible_application.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d527b105-bcd0-4be0-a752-e6ce475fb977/wajowewusadewenokir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5b079d1-7948-4267-9b11-d9e62bb004e8/how_to_stay_positive_during_anxiety.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8b09d05-d006-4766-9bc0-598608da983f/sujupafebozilegefijate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/367bdfeb-4177-4ed6-bee1-aaa1111cdd9d/nedasebutufarusavipifeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5985ff64-ac0c-4224-8fe7-9a045133b54b/mikezotutinurol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0ecf88f-2153-4f78-9a7e-523b18a1d499/larousse_gastronomique_book_price_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcb6bff6-71f6-4bb6-8bae-d142a983dc4f/30870681851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d8dcfd6-37a7-4551-9c5b-20c12c4ad9b6/dudesaxazijiganojeluw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc7c5a93-a7dd-4b1a-91d6-a93e1fb31089/what_are_the_keys_to_a_healthy_relationship.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_off0000cc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4F 5324 bytes
SHA-256: 036005e7f59252a563bc8650b8a544bfc576b0b25d70a1e09bfbb400126ba49d
font_01_sfnt_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 10188 bytes
SHA-256: cd14e0e9a3d05c297fb469edcf55de2f531205ffb18751a64fc3522411a2a2cd