Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47afa5fe4ca900a…

MALICIOUS

PDF

76.8 KB Created: 2021-03-23 12:00:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: eb67c297d49b6b23b86335cdeaf40d15 SHA-1: b6a21fb4f6b4ec72622b673898036a5c5f1e53a4 SHA-256: a47afa5fe4ca900ac9ad679b7d4e58b5d95c159229b3c88c9520239f06d9b9fe
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains strings related to search terms and PDF metadata, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/123?utm_term=skyrim+far+horizons+piano+sheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460457/normal_5fe58964912b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477649/normal_6035a5dcf362d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471682/normal_60265e9dd669c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_603c570b82eb7.pdfIn PDF document text
    • http://fodamibokaf.66ghz.com/77263691479.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485570/normal_6059b505922a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_8e1c066aa4ed4503863486f8b5759a85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/94dc06a1-1d95-4f51-aafb-9644c8512ef5/john_deere_mower_conditioner_for_sale_uk.pdfIn PDF document text
    • http://jefebewo.epizy.com/serial_extraction_case_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29ef4f89-38a9-4ef9-b3bf-800eddac270e/what_is_jensen_ackles_favorite_food.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_562ce2c6b64f49fb9710849746b27e29.pdf?index=trueIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_0c720c4b50c640da93f4e2faf459d482.pdf?index=trueIn PDF document text
    • http://vexowiwoputam.rf.gd/download_calling_sehmat_free.pdfIn PDF document text
    • http://wezojepodi.rf.gd/19888812650.pdfIn PDF document text
    • http://gosovugan.epizy.com/73159152971.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_f25f06db17e2496999552cc0633f3ae4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f42cbf-a6ff-416b-91bf-56a553ff09fe/16339282818.pdfIn PDF document text
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_8e864c4db95f406186a12623e38233d6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8e3928-3602-4609-b91a-804b45a01b92/sketchup_make_free_2017.pdfIn PDF document text
    • http://wojobawezelo.rf.gd/beditefamuruduv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee511603-0898-45b1-8959-300346396343/4544970389.pdfIn PDF document text
    • http://luwulifinuneti.epizy.com/light_relief_idiom_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b21f606-c56c-4d09-907a-f0d70d67a8f1/what_happens_after_99_year_lease.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_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 5428 bytes
SHA-256: 0bba140df1c725abffac2ae6a0acc2a6e5c775fa2aea1e8dd338989e9fcd727a
font_01_sfnt_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 15760 bytes
SHA-256: 6bcd483fe3de8c66b9cec4ad1a36de1096b12586bbf57cc1c94663d96d05217e