Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d38f1f03d80d64…

MALICIOUS

PDF

72.5 KB Created: 2021-03-18 06:06:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaabb84ab2632cbdcb13cb6a09db3998 SHA-1: 63cff4897bc448e70be08e268d35b180a375c240 SHA-256: 20d38f1f03d80d64d6c3c64938232041ef21f8bdebcafe55c852bd396a528381
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many of which are SEO-optimized and point to potentially malicious content, suggesting a link farm or phishing campaign. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links indicates an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=getting+ready+for+marriage+workbook+pdf
    • https://cdn-cms.f-static.net/uploads/4473638/normal_6036f2f600555.pdf
    • http://zajiledafalam.getenjoyment.net/jejajirawodusiwogerel.pdf
    • https://cdn.sqhk.co/makafabakuna/eVjhhhF/wozolozinoxamad.pdf
    • https://cdn.sqhk.co/rufopunuk/hcQHRgc/afterburner_arcade_controls.pdf
    • https://cdn.sqhk.co/lixozimiz/hdwidgd/endress_hauser_applicator.pdf
    • https://static.s123-cdn-static.com/uploads/4496577/normal_5fe1d079b66c6.pdf
    • http://likedizar.medianewsonline.com/85909734090.pdf
    • http://lowufadit.scienceontheweb.net/jidotebanudi.pdf
    • https://cdn.sqhk.co/feguzuvubut/8jihifA/tiwisukoxalir.pdf
    • https://cdn-cms.f-static.net/uploads/4369769/normal_601bb8de159ad.pdf
    • http://dikegebe.mygamesonline.org/66188426829.pdf
    • https://cdn.sqhk.co/wuxobilan/XhcOjc8/32345606546.pdf
    • https://cdn.sqhk.co/navotezive/pJ8jhpb/vojovorob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ff5ab256-a407-4697-91b9-141751226614.filesusr.com/ugd/4205e4_c41f8b584a4f418ab9f881693e842899.pdf?index=true
    • http://bunakakivukutus.epizy.com/pofubajotadawodakutuje.pdf
    • http://runapapaxezupow.rf.gd/castrol_lmx_li-_komplexfett.pdf
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_406ebac1e9b346b8b825c947b5ed1a4a.pdf?index=true
    • http://dereworizezo.epizy.com/arqueologia_biblica_para_creyentes_volumen_2.pdf
    • https://8e0cabef-d481-4215-b437-8a5fc4e4723c.filesusr.com/ugd/f41140_23b482c4e9c843578de1cff79e3a5b20.pdf?index=true
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_cff19285314241598cb3969d08509225.pdf?index=true
    • http://futikuzita.onlinewebshop.net/jupijajusobazinuvanoxa.pdf
    • http://jopewadakos.epizy.com/thermochemistry_hess_s_law_lab_report_discussion.pdf
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_a84254515b0f469faeec390e9d0b2650.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c6.bin
3855b86672c361ca23eb9f36926c620840f6c4fcc9d8064844e05865c46502a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 5580 bytes
font_01_sfnt_off0000ebcd.bin
20e97cca61c9af04d3282bbcb3ae2f32235649d68036993d2b874354f335ae61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 11492 bytes

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