Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f36c5b77b6d531f…

MALICIOUS

PDF

85.4 KB Created: 2021-04-04 15:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 795aa570a588fccb1ac6b4e19a8adaae SHA-1: 8e482908e72f9177023f28484b6369e0bf9080aa SHA-256: 3f36c5b77b6d531f5d6f4abde27991a0a1e7ad28c0312f2dc93c00dfc106731e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on `https://vilenefex.ru/aws?utm_term=qu%25C3%25A9+significa+cuando+sue%25C3%25B1as+con+alguien+que+ya+muri%25C3%25B3`. This URL, along with others on disposable hosting, suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to a phishing lure disguised as search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://vilenefex.ru/aws?utm_term=qu%25C3%25A9+significa+cuando+sue%25C3%25B1as+con+alguien+que+ya+muri%25C3%25B3 PDF link annotation
    • http://dimax.website/dufakijanegam0au6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_604eb37122a47.pdfIn PDF document text
    • http://gepopusoka.mypressonline.com/gaspard_de_la_nuit_aloysius_bertrand.pdfIn PDF document text
    • https://wijedokimevu.weebly.com/uploads/1/3/4/6/134649091/rutofefamogek.pdfIn PDF document text
    • https://rixodinek.weebly.com/uploads/1/3/5/3/135392020/4983638.pdfIn PDF document text
    • http://mekomob.getenjoyment.net/a_view_from_the_bridge_arthur_miller_download.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/92960569136.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493553/normal_5fe303e99a9ec.pdfIn PDF document text
    • http://damvglaz1.xyz/python_3._4_macuixnb.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/v_for_vendetta_free_movie_download_mp4.pdfIn PDF document text
    • http://varietystore.website/36731624166w2741.pdfIn PDF document text
    • https://wetuwene.weebly.com/uploads/1/3/5/4/135400298/jemajurusopu.pdfIn PDF document text
    • https://pilolekolaf.weebly.com/uploads/1/3/4/6/134655903/4057570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476936/normal_5fda09dc5e81c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_d3b21888c5e945288170816db6330875.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8397894f-b15a-4358-a2fd-aed4b413c3b4/driver_brother_mfc_7340_windows_10_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8176687b-02f0-4cfd-9f47-1626dd813c09/zarimaxizeduge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b24186e-6611-4f94-a66a-22899becac59/the_wave_utah_tours.pdfIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_39bdc0767a834d5286ed77b89c9eb0ea.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_d49b29e132044b4ba88648e50de36b11.pdf?index=trueIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_10f9efb068d749feb7b888026c439051.pdf?index=trueIn PDF document text
    • http://kepagewav.atwebpages.com/13579212430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d79746e-c83f-4551-804d-1d6889146db6/how_to_sync_xfinity_xr11_remote.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD74 5924 bytes
SHA-256: 2d9488eb79c1491cedae16c4af8343411d065a07eea6e576d70617d04060c0ad
font_01_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 11632 bytes
SHA-256: 854adb0faec68e440a163a024c9bdfb794d943369210195b877813712bae9ed4
font_02_sfnt_off00013686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13686 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c