Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fcf8d1d695d3716…

MALICIOUS

PDF

72.6 KB Created: 2021-02-04 12:21:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1c8e90d4e8543cf4cec7c937d7acf69b SHA-1: 37955420d611ca3d68a2cd93799f93b7d808aa34 SHA-256: 6fcf8d1d695d3716239eb3bd6c7b139a456a4b3e6ed29bd2e220ca2880492b16
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one pointing to a disposable hosting domain, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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/123?utm_term=philippines+country+code+and+area+code PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472774/normal_600b3a136aa3d.pdfIn PDF document text
    • http://figebofisekozoj.22web.org/bright_tomorrows_app.pdfIn PDF document text
    • http://rewutudot.iblogger.org/employee_appreciation_note_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422914/normal_60074fba49097.pdfIn PDF document text
    • https://cdn.sqhk.co/dakagugi/echgVEX/sky_rolling_ball_games_online.pdfIn PDF document text
    • http://takovod.66ghz.com/71983913227.pdfIn PDF document text
    • https://cdn.sqhk.co/pibegufuxova/BLrhcW7/diy_paper_crafts_easy_5_minute_crafts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_5fd0ea3a43241.pdfIn PDF document text
    • https://cdn.sqhk.co/kunutewiwit/hdidCIa/bejoremarefuvamavevox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zokivobadid.rf.gd/60427822997.pdfIn PDF document text
    • http://nufasezizanewi.epizy.com/avicii_without_you_lyrics.pdfIn PDF document text
    • http://jakunivejejaxo.rf.gd/39314207176.pdfIn PDF document text
    • http://wazozugafen.epizy.com/discounted_cash_flow_excel_template_free.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_off0000e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 5264 bytes
SHA-256: 500ff3889581ea695d31a4fc7da8ceab652063394f705850a70a3bb1806c6d7c
font_01_sfnt_off0000f2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B8 10276 bytes
SHA-256: 27cf5dc5fc7cdffea62f8e3a4a1c268d0de2f39328f9c00d973602d18569adcf

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