Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65bb487139da511…

MALICIOUS

PDF

82.5 KB Created: 2021-04-03 09:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 36f527348df6d85ae11abcf1736ed540 SHA-1: 487dd9c2ed898205ac83f963c4fafc7858d8bd24 SHA-256: b65bb487139da51155794ab7818b879fdb309cf717e507b83d9a39aef30d2195
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • 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://dafemum.ru/strik?utm_term=how+to+add+programs+to+casio+fx-9860gii PDF link annotation
    • http://fefiwizam.sportsontheweb.net/what_percentage_of_oxygen_do_you_breathe_in.pdfIn PDF document text
    • http://susurrus.space/i_robot_cast_tvd9yd3.pdfIn PDF document text
    • http://zuraleres.mywebcommunity.org/arbitration_and_conciliation_act_2020_amendment.pdfIn PDF document text
    • http://midimox.getenjoyment.net/25585199288.pdfIn PDF document text
    • http://vivudanu.scienceontheweb.net/26551067100.pdfIn PDF document text
    • http://kuzososo.mygamesonline.org/26081842732.pdfIn PDF document text
    • https://jimamejovegevag.weebly.com/uploads/1/3/4/5/134593921/d880a27ca2d9e.pdfIn PDF document text
    • http://hd-cam-mirror-up1.club/chick_fil_a_customer_service_training_manualu8ein.pdfIn PDF document text
    • http://iciapp.xyz/wafabexefetexizexaxifigozhz7bw.pdfIn PDF document text
    • https://dekupepevimozis.weebly.com/uploads/1/3/0/7/130738652/gikarofisovisusaz.pdfIn PDF document text
    • http://storeyou.store/gesodufizigasusorfmcbj.pdfIn PDF document text
    • http://luwinilulurop.mywebcommunity.org/dazedago.pdfIn PDF document text
    • https://gerunujixode.weebly.com/uploads/1/3/1/6/131606408/5109083.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/6735786892.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/will_star_wars_have_another_trilogy.pdfIn PDF document text
    • https://kixovojowabib.weebly.com/uploads/1/3/5/9/135966002/kowujurujutow-bizadobojamixu-modorodoza.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
    • http://ginowane.onlinewebshop.net/pexaroxewesos.pdfIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_694e7be52c5345a4ae27d7d67d53a259.pdf?index=trueIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_7bc36b2a82a747a79f2463ccd1997d6d.pdf?index=trueIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_6b3116a9fdb84d1698b1c7d3d5ca1858.pdf?index=trueIn PDF document text
    • http://zonatitusajobo.onlinewebshop.net/is_bottled_water_free_on_royal_caribbean.pdfIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_cce38316ce5f4b02ab6dd06cafd0f2a3.pdf?index=trueIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_7229a3b22b00439fa5e165e5aa6a4c4b.pdf?index=trueIn 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_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 5808 bytes
SHA-256: 432d97d22ca04a49bef945f87f6470ab3cd1fc5944dde4b553d3c5d3a2ae9c8d
font_01_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 10464 bytes
SHA-256: 17c7e08a36527e7c20d62737e42fef136b8b797c2a99424ef1b76056b64a9cb7
font_02_sfnt_off00012dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFB 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e