Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a4fd05f9e95ccf…

MALICIOUS

PDF

80.0 KB Created: 2021-03-18 07:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1890808619713085eb83f0a788c8e52c SHA-1: b5155bb014901be960273c799b92e778d42f8f5d SHA-256: 97a4fd05f9e95ccf70f461d0af9ca68c326678ae0d6ab1ed1e80c156394a52de
134 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting it's designed to redirect users to malicious content. The presence of a download button heuristic further supports a lure-based attack pattern.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/123?utm_term=suit+punjabi+remix+song++mr+jatt PDF link annotation
    • http://gemajelibetojup.scienceontheweb.net/89672209580.pdfIn PDF document text
    • http://show-visitor.xyz/357118794875yu3h.pdfIn PDF document text
    • http://datab.vip/93870223451d35yy.pdfIn PDF document text
    • http://fly-drive.online/united_merchant_asset_recovery8576h.pdfIn PDF document text
    • http://wulutano.mywebcommunity.org/wuliva.pdfIn PDF document text
    • http://mebel-albero.ru/radaniwpp9hm.pdfIn PDF document text
    • http://efarbok.xyz/64309436314b5rjo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412902/normal_5ff687808ca48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415326/normal_6023a875ee7a0.pdfIn PDF document text
    • http://milesnires.xyz/mailing_list_template_numbersu3nvr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414153/normal_600e35da7216c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gitojaxekeveki.onlinewebshop.net/13966287034.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_06955e576da9499288334fb7e7e9ae42.pdf?index=trueIn PDF document text
    • http://jisijuvod.myartsonline.com/how_to_bar_a_soldier_from_reenlistment.pdfIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_d015cb798cd94ff789e74eeac9a23cee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d99e5961-9bad-482c-83d5-a6a908032537/megiwofasikakosoxixof.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_8035bb98cbbb40a7933e4714fd9a7ffb.pdf?index=trueIn PDF document text
    • https://44bb6ee8-a0fe-4f72-890f-0f0a2fec05cf.filesusr.com/ugd/b65acf_31c8e64904f64b1fb7d51dfe9b10bb9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a50d15-3ae1-4385-8972-478d02b5d742/lemomepirovav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38db327-2a8e-4911-a02a-54ee6826bda5/31987729641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b02e7c0-3280-48ee-a585-4838a7aece0a/how_to_connect_wireless_mouse_without_the_receiver.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE397 5492 bytes
SHA-256: 71dfdf4a05a2d50a7b0c1ab6230dab457f73b79299b3b9bd7448db32a9082df7
font_01_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 11616 bytes
SHA-256: 4d54ba036be7d275ac7d28f60ae3c2c8a9145b5bc695f16480bcbfe2c00605b5
font_02_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3