Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f55080df09bb880…

MALICIOUS

PDF

85.4 KB Created: 2021-03-15 08:32:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ec46abca2daea2998c2e4284d249a124 SHA-1: 321f7356a39450c663036abc94775cb156710824 SHA-256: 4f55080df09bb880636a081b810425dcdacc62df6be1541dc995c75eb01643bb
244 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and redirecting to potentially malicious sites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the document's structure and embedded links are designed to lead users to external, untrusted content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=estrus+synchronization+protocols+in+dairy+cattle+pdf In PDF document text
    • https://newomuzupigew.weebly.com/uploads/1/3/4/4/134468212/8299379.pdfIn PDF document text
    • https://zejewovelopitut.weebly.com/uploads/1/3/0/8/130813539/c8ccfae06d8a598.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/tazajuwaluzedutimirafir.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/onn_wireless_mouse_connect.pdfIn PDF document text
    • https://runeburagaxe.weebly.com/uploads/1/3/4/6/134699488/429999680.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwilaj/iicigha/tracheostomy_change_procedure_note_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424043/normal_5fdc773878810.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/cfjeIhe/space_rangers_2_reboot_download_free_full_version.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/ggcYjfN/pisilasezorasiparovemok.pdfIn PDF document text
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/jawoma-gaxojikuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418796/normal_5fe095f56ad59.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/8e6528bf-a4a7-4ede-b344-af5455495b25/sodastream_one_touch_bundle.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/73198426823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/115e55cd-64d1-4194-944b-2d542479c293/how_to_use_noco_genius_2_battery_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b631de-5add-42a7-93ce-b095b5965232/craftsman_88173_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28963a1f-9263-418c-9560-39adf3039bf6/mibowuxu.pdfIn PDF document text
    • http://wuragumok.atwebpages.com/40k_codex_8th_edition.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/define_job_description.pdfIn PDF document text
    • http://davofunup.onlinewebshop.net/nafivisuzibefor.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_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 5352 bytes
SHA-256: e6a7283089012bb8329166bb58d81192dd62bbca751b8714b189c43309054c5b
font_01_sfnt_off0001209c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209C 12020 bytes
SHA-256: 87d5c0210ebec7992fcad5973eba8ddad7cc845defe13644db5d2b401f0777d5