Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81cf106d78d4344…

MALICIOUS

PDF

78.1 KB Created: 2021-03-21 04:13:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e16a85df494f240a17cea87e19849155 SHA-1: 18d580d347e66a062e7a47b1b93d7ca04fb36191 SHA-256: d81cf106d78d43444dfdce9780b3031d2d3a4bf4da0395128b8cdc9cd0c6ccb6
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 0.9991

Heuristics 5

  • 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.
  • 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://jottigo.ru/award?keyword=wing+chun+basics+pdf PDF link annotation
    • http://pedaxofanor.mywebcommunity.org/common_meter_reading_instrument.pdfIn PDF document text
    • http://vubitim.sportsontheweb.net/nikulikuwawoboda.pdfIn PDF document text
    • http://jakor.pro/chemistry_ch_8_class_11th865d1.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/wivutazafapetujeko.pdfIn PDF document text
    • http://kukushpa.fun/kabariqw07v.pdfIn PDF document text
    • http://1ux.site/todigivalezobexesu4jq9p.pdfIn PDF document text
    • http://pugaxokip.22web.org/19143911776.pdfIn PDF document text
    • http://amorexpo.com/onan_7500_quiet_diesel_generator_troubleshootingq3llt.pdfIn PDF document text
    • http://tuvobanunezito.22web.org/alter_ego_libro_de_frances.pdfIn PDF document text
    • https://cdn.sqhk.co/wofunukasu/ieq4Jjb/sitiveteviranolurevix.pdfIn PDF document text
    • https://cdn.sqhk.co/supesuvepo/ehbgjie/22409700909.pdfIn PDF document text
    • http://galabogenezoso.getenjoyment.net/bazenegujixekupuvogefeda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_ff8553f0773e48bea19cc1c4a22d1c00.pdf?index=trueIn PDF document text
    • http://sogivuwe.onlinewebshop.net/99819179531.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/gufonamuvijenifi.pdfIn PDF document text
    • http://jupexalamax.epizy.com/edit_text_directly_online.pdfIn PDF document text
    • https://01c4c9a3-ee74-4db9-a65d-799443b8dbf1.filesusr.com/ugd/a64c8c_df0909d2ca7045aba1ebdb3d46946c9f.pdf?index=trueIn PDF document text
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_aaec5fc85cd24a19b1614e68128f513e.pdf?index=trueIn PDF document text
    • http://duvodix.myartsonline.com/classic_human_anatomy_book.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/5861841948.pdfIn PDF document text
    • http://novogizeboje.myartsonline.com/93792137862.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_6a854b1229c44a81a106eeee4c11905e.pdf?index=trueIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_b8fbe45803d547ba851b896d0cfa3c26.pdf?index=trueIn PDF document text
    • http://garonidu.epizy.com/fusion_360_tutorial_files.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_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 5440 bytes
SHA-256: 3965af9e0c8b1d461a4626468661fa6cb72c9fcc73c88894bf4e30b03cbbb017
font_01_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 11260 bytes
SHA-256: cc39276bf606e37508786aeaf4fa16f1437e2be889cc2df6bafdae001a05fd24

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