Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7fed5dce2471400…

MALICIOUS

PDF

75.5 KB Created: 2021-02-22 14:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8a6a1ce5e8dc3d087961b0142dff5fc7 SHA-1: bd38a7f382cd4980103a33ce02342459b00b4de3 SHA-256: d7fed5dce2471400ee8f4b47f11bef996f42fc75d36d8cdbd562200d1557b218
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs that point to potentially malicious domains, as indicated by the 'PDF_URI' and 'EMBEDDED_URL' heuristics. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm the malicious nature of the file. The presence of multiple disposable hosting domains suggests a phishing or malware distribution attempt.

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://crophysi.ru/123?utm_term=the+power+of+one+book+cover PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420907/normal_5fd653ec64280.pdfIn PDF document text
    • http://lavkavkusa.store/6197676667607mk4.pdfIn PDF document text
    • http://detaxinema.22web.org/zodedafipoboxutawogaretif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489428/normal_5ff8a45f3c339.pdfIn PDF document text
    • http://iuts.space/45049528771c9j5d.pdfIn PDF document text
    • http://xumimoz.22web.org/cadmio_en_el_cacao.pdfIn PDF document text
    • http://buviturowugigew.66ghz.com/91935038689.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zugoxovok.epizy.com/nawazuvelaxamimegibene.pdfIn PDF document text
    • http://kofupugixujodin.epizy.com/shih_tzu_dog_information.pdfIn PDF document text
    • http://sonasekofuxix.rf.gd/android_7._1._1_frp_bypass_2019.pdfIn PDF document text
    • http://gatapin.rf.gd/lagu_blackpink_whistle_korea_versi.pdfIn PDF document text
    • http://piduvazudofem.epizy.com/blood_relation_questions_ibps_guide.pdfIn PDF document text
    • http://vufuxit.epizy.com/adding_binomials_and_trinomials_worksheet.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_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 4988 bytes
SHA-256: 84aab8676aca077166f2ce6be4c1106228cf374725f8f33b81444e31250314b5
font_01_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 11288 bytes
SHA-256: 8232d8e1fa91607af5e0ac567f572e4d8b928fca0480e2224dbc1397af23ca73

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