Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90d3b295cc0acb7…

MALICIOUS

PDF

81.7 KB Created: 2021-03-31 09:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a8adf6a5aad47f6abccd296e2297cfb2 SHA-1: 544b38941564f095d648a583a6c7fcef2f8596f1 SHA-256: f90d3b295cc0acb7974982976eee96a0d13a3fcc6f0cd13907c933a0682f9aff
134 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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=fall+river+housing+authority+fall+river+ma PDF link annotation
    • http://lbaranaydin.com/kbb_rv_guideldaef.pdfIn PDF document text
    • http://useplafond.xyz/95342338365kmw5y.pdfIn PDF document text
    • http://gojoxoxuda.22web.org/bsc_physics_mechanics_book.pdfIn PDF document text
    • http://kolegutoravi.mygamesonline.org/tamaxipaw.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/98876097180.pdfIn PDF document text
    • http://komarovskii.xyz/bivetisifidovujur2dnfw.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/fuvixoxibofunib.pdfIn PDF document text
    • http://wedasuf.getenjoyment.net/50500783523.pdfIn PDF document text
    • http://mofonuf.medianewsonline.com/buziredi.pdfIn PDF document text
    • http://nulivanofika.mygamesonline.org/notokofodez.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/shipping_and_logistics_management_download.pdfIn PDF document text
    • http://tetizeniwa.mypressonline.com/what_is_the_meaning_of_dip_dip_potato_chip.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/calvinism_versus_arminianism.pdfIn PDF document text
    • http://napodosawukezob.getenjoyment.net/accounting_standard_30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_f2bf8415767f4118b062ebec28c3ee47.pdf?index=trueIn PDF document text
    • http://xasejumav.onlinewebshop.net/ramolen.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/operations_research_masters_rankings.pdfIn PDF document text
    • http://dagaratula.rf.gd/tabewupapuputezokax.pdfIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_98183d02608a4f2e87db223f6173ca02.pdf?index=trueIn PDF document text
    • http://kawojimulogizef.rf.gd/gafajogelavilasovirorat.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_fe9116d8cfa3459684ba8c6fa14a3116.pdf?index=trueIn PDF document text
    • http://tisuvelepep.rf.gd/nudakokuwixipatiwilenulu.pdfIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_ff0cfadd82ef4eebb1d85a06d6f6e645.pdf?index=trueIn PDF document text
    • http://ligoroxenafof.atwebpages.com/liluwemuvup.pdfIn PDF document text
    • http://jasosuwer.epizy.com/button_onclick_submit_form_jquery.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_off0000fe73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE73 5300 bytes
SHA-256: 9a2e3512e8479de20b3b3a0ba22c5a7d89aab047fdcf35c13ea4a43ad4d05e72
font_01_sfnt_off00011062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11062 11416 bytes
SHA-256: ace9177ee7fb487fa9bf8a108b2c0d3e0eca21b71616860a1b99e0e6cdcdbac9