Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf149e7ece8034c…

MALICIOUS

PDF

78.6 KB Created: 2021-04-04 02:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 679ae2bda8facee98fd3dff6d54d675f SHA-1: d36c11b2dcfc83f8cda91a3bb17eef6a51b78e2f SHA-256: dbf149e7ece8034ce071ab04ea7e07227fa5d491a565fd984e2582f2bff8b6ee
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable domains and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=us+military+bases+in+germany+2020 PDF link annotation
    • http://neo-tp.ru/how_to_connect_atmos_speakers_to_onkyo_receiverg1n9a.pdfIn PDF document text
    • http://werewinavif.22web.org/maggie_a_girl_of_the_streets_chapter_12_summary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403120/normal_602d72f029138.pdfIn PDF document text
    • http://creditreportus.info/950120485808we0m.pdfIn PDF document text
    • http://rukofuvifoti.22web.org/book_cover_design_template_ai.pdfIn PDF document text
    • http://goxaterajeronaf.22web.org/vopamikufepepemuralirez.pdfIn PDF document text
    • http://wuwetinaj.22web.org/psychological_facts_about_human_body_language.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_604e94345f42f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444853/normal_5ff8b12c5ce75.pdfIn PDF document text
    • http://pupofikavize.iblogger.org/fazujifuxenebud.pdfIn PDF document text
    • http://wixiziz.iblogger.org/8798142844.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476432/normal_60170e8a43e2e.pdfIn PDF document text
    • http://gifudevuf.iblogger.org/kefemo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d715ac24-29cf-42fe-bf99-108beed4e2b7/21911063236.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66129b66-41b7-4554-a13c-015ef8965436/vitamix_5200_vs_5300.pdfIn PDF document text
    • http://baduvebeketuwo.epizy.com/99137591886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f7f51a-36e6-43c4-be5d-a83ac01736ea/is_20th_birthday_a_milestone.pdfIn PDF document text
    • http://kuzelewekupe.epizy.com/wegotixufuropudedirel.pdfIn PDF document text
    • http://zerakunutage.epizy.com/top_startups_in_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec20deb4-1b49-43f3-b737-3da18fe45dcb/6488269371.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d224375c-4a39-47de-af02-d0bed3352a65/craftsman_drill_press_for_sale.pdfIn PDF document text
    • http://puzulipanaro.epizy.com/felusozikomawuxonaboje.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_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 5512 bytes
SHA-256: b8e76ad00975c382403b23474457e3fba44791b8c8e9f56e9716a4841cc35226
font_01_sfnt_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 11304 bytes
SHA-256: d9fb6b6279cd7b23a9ef0c37f6d7e4ed19f2d0a1613f53d032021e95fe4f6883

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