Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f8849e24158ff4…

MALICIOUS

PDF

83.0 KB Created: 2021-02-16 08:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b96e9a99defc7f1114db21d7e32d55f6 SHA-1: 92d0c312a964663ef933b070121f585909990343 SHA-256: e0f8849e24158ff44e6ac3ca2bb9acc701ea702f26c28a6e0e0f1c916fae10cb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this PDF being used as part of a link farm to distribute malicious content or phish for information. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=what+is+the+significance+of+new+moon PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489740/normal_60143a479a076.pdfIn PDF document text
    • https://lobakazuperowe.weebly.com/uploads/1/3/4/3/134352895/4ee8f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450438/normal_5fe02f56aaf24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477658/normal_5fc5ece1620f2.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/dJjahga/callbreak_multiplayer_mod_apk_download.pdfIn PDF document text
    • http://nevozepamuj.iblogger.org/57213532738.pdfIn PDF document text
    • http://efarbok.xyz/video_er_apk_vidmatep39jf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463551/normal_600987149851e.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/balqsUk/97831433842.pdfIn PDF document text
    • https://cdn.sqhk.co/jivumigen/ibnEE7m/sejasovoveripogazan.pdfIn PDF document text
    • http://fekedusotuxena.iblogger.org/ielts_writing_sample_test_with_answers.pdfIn PDF document text
    • http://carbackseat.site/543282055638fud3.pdfIn PDF document text
    • https://lugilalosu.weebly.com/uploads/1/3/4/3/134314137/ff7e806e6f0.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/AKjcjd3/munojerolazebemos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wokikeka.epizy.com/fusadoparurugivuxonol.pdfIn PDF document text
    • http://zikenonuto.epizy.com/interactive_science_notebook_6th_grade_answers.pdfIn PDF document text
    • http://pevoxetawalob.rf.gd/adobe_acrobat_pro_paid_apk.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_off00010791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10791 5272 bytes
SHA-256: dcd6d5e52242ab47720f7e351be100cd2e37877d2f9513852f5f2fbbf7305153
font_01_sfnt_off00011980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11980 10924 bytes
SHA-256: 2c9ecf7db3af93975c651dafde22a0801816c1ff1ee76887c0e259223228048b

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