Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdea4d1dff00bbc1…

MALICIOUS

PDF

112.5 KB Created: 2021-02-20 02:27:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9535ffb8cea65086ad22bb4aafe001ac SHA-1: 756590655481ccb4b11a9337658644e42915c076 SHA-256: bdea4d1dff00bbc1be892c205c6e47adc3ccb3b3eec5df2f6fa730d89308828a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files. One of these links, 'https://bologen.ru/wix?keyword=porque+es+importante+la+economia+internacional', appears to be a lure. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' and the ML classifier output strongly indicate malicious intent, likely phishing or malware distribution via the linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://bologen.ru/wix?keyword=porque+es+importante+la+economia+internacional PDF link annotation
    • https://katudiwuf.weebly.com/uploads/1/3/6/0/136006549/ninegonapa_banofifonemed_bizujexusitimuf.pdfIn PDF document text
    • http://lnstagramoriginal.com/ib_physics_projectile_motion_worksheett0xev.pdfIn PDF document text
    • http://airet.space/soniwexasurd6g5r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387218/normal_601c00610b8e7.pdfIn PDF document text
    • http://salonop.xyz/16022846696v94x0.pdfIn PDF document text
    • https://xumebarukez.weebly.com/uploads/1/3/4/6/134687090/toluvizafewow_gerodisu_degokesej_tiwafalusen.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/ujs_portal_pa_court_docket_sheets66xj3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382779/normal_5ff33d765724e.pdfIn PDF document text
    • https://xinewufovina.weebly.com/uploads/1/3/4/2/134235071/diwifiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/30622316472.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/artifact_gitlab_api.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/sepabesajuwukir.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/how_to_fix_ice_machine_in_freezer.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/what_is_the_role_of_an_office_manager_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/melirexitapijadinimoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/dark_theme_wallpaper_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/daily_meal_planner_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/r_d_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/anonytun_pro_apk_ios.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_off0001794e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1794E 5208 bytes
SHA-256: 46332260353c2bdd5f4886cbeba8bddbdc4d18456a9a3c8600964c5cd775fec7
font_01_sfnt_off00018aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AEE 12168 bytes
SHA-256: f15a8f22a44f886075efb472e6d07fe226abc08ac75fee49264dbfca7cc505e7

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