Malicious PDF — malware analysis report

Static analysis result for SHA-256 92151a6a1ae9b94a…

MALICIOUS

PDF

73.9 KB Created: 2021-02-07 14:27:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 298016459ba52bfff791ccc2e23e1102 SHA-1: e1fb39ef4c9dacd19df0227ae0d343c2a2264e96 SHA-256: 92151a6a1ae9b94a48895f1bc6dd68a745de1780376d765c5a9f374f9e8abe2f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://bologen.ru/123?utm_term=mezzo+social+work+jobs PDF link annotation
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/d17909071.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxinugad/ZgjXhLI/kujanuwa.pdfIn PDF document text
    • http://organic-ita.space/sepefidewejifewo9t3wg.pdfIn PDF document text
    • https://cdn.sqhk.co/ruperodu/ijZHgfz/gitopafopifemasabajazarof.pdfIn PDF document text
    • https://cdn.sqhk.co/moxulofilose/XFgcjbX/nifog.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/bififia/acc_football_predictions_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/Aibgjjs/free_color_world_go_launcher_theme.pdfIn PDF document text
    • https://vuguzakinizole.weebly.com/uploads/1/3/4/4/134493236/391004.pdfIn PDF document text
    • http://rabota-plus.club/after_you_jojo_moyes_download6zb12.pdfIn PDF document text
    • http://sinoniwim.22web.org/vehicle_log_book_template_excel_south_africa.pdfIn PDF document text
    • https://cdn.sqhk.co/digijodaga/Ykge0IT/xufexit.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/ipLgfA9/prank_call_hello.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zukopeziwegufu.epizy.com/34097014506.pdfIn PDF document text
    • http://gujupikisikali.epizy.com/w3schools_web_page_templates.pdfIn PDF document text
    • http://ganesuk.epizy.com/cisco_crs-_8_s_datasheet.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_off0000e525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE525 5220 bytes
SHA-256: 354219d6deb5716e84ef364fd3baa0cb6c482fd4bd13b34af0fe08a398344850
font_01_sfnt_off0000f71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 10488 bytes
SHA-256: 7a65b05bdcf863eb73a82755d6bb68bf402541662dbbb0f0b976391f7cd4241b

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