Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d5ea731113cdb8…

MALICIOUS

PDF

75.0 KB Created: 2021-03-30 09:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f2d0d9055667600e0171de20b1daad5f SHA-1: b41d2979d19a7a7b2bbb31b6f47cd0059d3fc868 SHA-256: 26d5ea731113cdb8e4c7941830d4994896af4b78f214c23799437eea8dc16b67
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary URL observed is 'https://resalured.ru/award?keyword=atmega328+circuit+diagram+pdf', which is likely part of a scheme to drive traffic or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/award?keyword=atmega328+circuit+diagram+pdf PDF link annotation
    • http://pozuvixa.getenjoyment.net/mijagowerulukoniju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492897/normal_5ffb09e9f404f.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/3a8d9990a9.pdfIn PDF document text
    • http://jipetabonitu.mywebcommunity.org/79251929092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419644/normal_605f748b2a05e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403121/normal_5fd1d47e66c15.pdfIn PDF document text
    • https://vexigijetizi.weebly.com/uploads/1/3/4/7/134771524/8d4eac.pdfIn PDF document text
    • https://gexokatex.weebly.com/uploads/1/3/5/9/135960098/sesujaxixisageve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496584/normal_5feff06e1d61a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491936/normal_601977cba7c86.pdfIn PDF document text
    • http://vevovifox.scienceontheweb.net/how_to_have_boundaries_in_marriage.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/8a58b5da-eaf8-4a08-8c21-593d1bc3d33e/beats_solo_2_wireless_headphones.pdfIn PDF document text
    • http://maretubozewugi.myartsonline.com/32186368130.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7653854d-3ac9-428a-a216-57a7c1734ce4/how_to_write_no_solution_in_set_notation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fed2c95-8fec-4078-803f-47b21ed6a992/telitomowetotizow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae6e9ae-f1e1-443f-b7c2-fe7242458d37/what_is_the_meaning_of_islam_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae9066b0-98c3-47ae-a0e4-41bea1ba1c1d/pamirevubomugata.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/824bc618-41ab-4396-bdcf-30b522f01f6d/85224678977.pdfIn PDF document text
    • http://kuwijiti.myartsonline.com/7992191236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62f80543-cef7-4035-8382-2cfab5c5caba/how_to_turn_off_touch_screen_on_acer_aspire_v5_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc0a9a7-3149-4b0d-bccc-53a689de60d5/tagujokariwuxuketomun.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_off0000e75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 5744 bytes
SHA-256: 2760108feecea51b0f1d219846a6f4f9da1c6eb56248028197a38760fb2f7e28
font_01_sfnt_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 10320 bytes
SHA-256: 5ba2c8185c47b8f9a68eb766fa43487466e9bcaa873cb1272a605f110a5069c9