Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f8e1216dae67c6…

MALICIOUS

PDF

69.3 KB Created: 2021-03-05 04:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 425c19d2ea85ac4cce980521fcac6569 SHA-1: 9a4938c3a95bb67471587f41466a556fc4cb439e SHA-256: c9f8e1216dae67c6755a07601e91878e7e820ff2a06eb48169552ebdcf7e310f
66 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9998

Heuristics 4

  • 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://pelibifir.ru/wix?keyword=introduction+to+anatomy+and+physiology+chapter+5+answer+key PDF link annotation
    • http://mujusudi.iblogger.org/saxawafikesip.pdfIn PDF document text
    • http://powerhdniy.space/behringer_inuke_6000_dsp_manualhb8qv.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/qhcHjdT/talking_tom_wallpaper_apk_android_1.pdfIn PDF document text
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/6239017.pdfIn PDF document text
    • https://gorogonib.weebly.com/uploads/1/3/0/7/130775466/wadumaginumen.pdfIn PDF document text
    • https://lokanasa.weebly.com/uploads/1/3/5/2/135299929/lemolafuni.pdfIn PDF document text
    • http://najefot.22web.org/bronchiolitis_handout.pdfIn PDF document text
    • https://cdn.sqhk.co/bezofusipow/jgjeOjh/rejetomofesetonuzevapoted.pdfIn PDF document text
    • https://wavurujubatebar.weebly.com/uploads/1/3/2/6/132682053/5737697.pdfIn PDF document text
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/0e4073.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/ihehhge/car_payment_calculator_with_trade_in_and_taxes.pdfIn PDF document text
    • http://marafonsport.site/732264122394hist.pdfIn PDF document text
    • http://chunyoo.com/pelicula_de_nito_e_neto_detectives_pmdamm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://satoposip.epizy.com/5871243215.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/27846303774.pdfIn PDF document text
    • http://zezuwolajo.rf.gd/math_proof_definition.pdfIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/52014614487.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/70292935259.pdfIn PDF document text
    • http://dotenax.rf.gd/femowisifusov.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_off0000cfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD5 5808 bytes
SHA-256: 29c67f0df42c91b969fe55b492661f3f00bb419bbaeea1dd01141d359eadb8b9
font_01_sfnt_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 10436 bytes
SHA-256: a13502960b006b64cdf044c742fdd4589e51bcc6702e8b0cd8df9812b41ad4e0

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