Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b15ea15ab5e45d…

MALICIOUS

PDF

80.9 KB Created: 2021-04-05 09:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 69680438290d57d29bc94a6df53ecaec SHA-1: 95e4caa6657fe93f95d76be92f57a514e7cba854 SHA-256: 81b15ea15ab5e45de3773a941794b622af62a84b99488f7f238f1a09b21e16b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/wix?keyword=adguard+premium+apk+2018+download PDF link annotation
    • http://zipafaxelati.sportsontheweb.net/79596124844.pdfIn PDF document text
    • http://sysfix.ru/81949763549eqeow.pdfIn PDF document text
    • http://pozebesibi.22web.org/poxivelerafokelarodunux.pdfIn PDF document text
    • https://cdn.sqhk.co/womawuxinuge/2yKhcwt/60221314510.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/jejcSjf/69084371563.pdfIn PDF document text
    • https://cdn.sqhk.co/muxaferamet/KQqLjdw/firafiluvod.pdfIn PDF document text
    • http://fodasirosawazim.22web.org/52669094471.pdfIn PDF document text
    • http://namabal.scienceontheweb.net/7637371768.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/6427865689.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/introduction_to_spatial_analysis.pdfIn PDF document text
    • http://dommasters.site/why_is_my_wifi_randomly_not_workingm2m6w.pdfIn PDF document text
    • http://jubevodume.22web.org/23449619621.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ximitexus.epizy.com/carrie_a_estranha_tamil_dubbed_movie.pdfIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_456c4ed229e94183902b8cbcc5ee9176.pdf?index=trueIn PDF document text
    • http://sodojok.rf.gd/agriculture_in_telugu.pdfIn PDF document text
    • http://mexorilurolepap.rf.gd/bapeni.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_1219a5831b51418eb47d71a23c5eb4b1.pdf?index=trueIn PDF document text
    • http://najirukijo.rf.gd/xojedatex.pdfIn PDF document text
    • http://jilevatawew.epizy.com/u_l_s_i_ka_full_form.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_3a4eb1d74394486d82f54fd6b28d2d20.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_7f376794d3db4c76aaa73861391890c6.pdf?index=trueIn PDF document text
    • http://katevafitaga.epizy.com/2369516247.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_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 5764 bytes
SHA-256: 305016ae456c14c598baf501985cd47ace011f46d39ce298fc94adab7a537b94
font_01_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00010e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6A 11888 bytes
SHA-256: 707b7f4fa529fd69af6329a43e1a1dc764bfb301f3f4940345a5a57ef29add42