Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b4e3625c788392…

MALICIOUS

PDF

76.4 KB Created: 2021-02-26 22:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 3320cef5bf1c524e53ad82181372647a SHA-1: d2cc99c52b6bd6cdc4ed6cd5c2a81808f4a062ab SHA-256: 07b4e3625c788392baa084c313c7fff4a3d1eecca2514fb3892236b18b58dfc9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'midufefew.ru', which is likely used to host a phishing page or download a secondary payload. The document's structure and embedded links suggest it is part of a link farm designed to obscure the true destination, a common tactic for distributing malware or conducting phishing attacks.

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 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://midufefew.ru/123?utm_term=bmw+e39+wiring+harness+diagram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365547/normal_6016374c8f057.pdfIn PDF document text
    • http://phrensy.co/932829575384olv7.pdfIn PDF document text
    • http://bururofag.iblogger.org/arduino_ide_chrome_os.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494877/normal_5ff8f871626cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_602937c44c663.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/67465006773.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/autor_del_libro_curso_de_milagros.pdfIn PDF document text
    • http://curvepreloved.com/pefarim8hbn.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/wemokujazujiwelogopas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417983/normal_5ffa8ddb44a86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/risalenefazozo/public_relations_specialist_salary_oracle.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/chelsea_fc_logo_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/rixeridop.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_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 5268 bytes
SHA-256: eae4025aacd02c6cc7b5a89caa30aaecded1089654cd1c2e6955204d570d38d5
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 10024 bytes
SHA-256: 10a7eafbf1a2b8a6b2fede2fcabc848040e9d511aa859fcd98cb9c7ff8a4ad7b
font_02_sfnt_off00011719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11719 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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