Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bef46c7fee8d4ec…

MALICIOUS

PDF

77.8 KB Created: 2021-02-28 12:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1962e0059f37b2a2db8499318e60a86e SHA-1: 213395e7203a3ea8fc33ae0ae77f0424f1e22eb9 SHA-256: 0bef46c7fee8d4ec91bede7accf165e9cefedbc8b8f18bba29fddeec54dc8b59
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 0.9997

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://seumenha.ru/strik?utm_term=myron+mixon+mustard+bbq+sauce+recipe PDF link annotation
    • http://comp-arenda.site/pikovozr86gu.pdfIn PDF document text
    • http://leomannapov.com/13433046980j0dcx.pdfIn PDF document text
    • http://volosaty100.xyz/mathematics_all_symbols_name4s5sx.pdfIn PDF document text
    • http://digtalcaliper09.xyz/integral_csc2_xhq9la.pdfIn PDF document text
    • http://persequen.com/what_is_the_best_rainbow_six_gamedl003.pdfIn PDF document text
    • http://kefojixesopu.66ghz.com/omnisphere_2_lowest_price.pdfIn PDF document text
    • http://good-production16.site/compensation_survey_reportc8bw2.pdfIn PDF document text
    • http://akvatehnika74.ru/kisurimulakibupokasefadkv86x.pdfIn PDF document text
    • http://copyrightnotices-form.com/dnd_5e_gunslingerdulfv.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/remomerifiguzibuk.pdfIn PDF document text
    • http://tubebegerisozo.iblogger.org/kindle_fire_hd8_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/kogoruzojif/CFxhdig/xususetolekaxanugonazana.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepiliga.epizy.com/wogul.pdfIn PDF document text
    • http://zabukek.rf.gd/ashrae_handbook_fundamentals_si_edition.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_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off0000f2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A3 5628 bytes
SHA-256: 728e024910f33ee126633569f9c300f16bff3257700e4bb2feea14eb0ad7083d
font_02_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 10664 bytes
SHA-256: 436f0019967641ad61e1f8df5480ba013da7201e7f58d76375344eb68c596a8a