Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae414709bbc1868…

MALICIOUS

PDF

80.5 KB Created: 2021-02-14 02:44:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fef0d7ca160188eeb633a1ad97b4eab5 SHA-1: ec7106d381b4f3bcd6a542b4e71f3a56baaae61e SHA-256: 9ae414709bbc1868f4eae4854879fdba1ab432f7ab2fbed851ec4a51ad3c7f4c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including one to 'leonvi.ru', disguised as comprehension worksheets. The PDF's structure and the presence of embedded URLs suggest it functions as a lure to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wb?keyword=comprehension%20worksheets%20for%20class%207 PDF link annotation
    • https://betubuko.weebly.com/uploads/1/3/1/3/131379781/a15ebde.pdfIn PDF document text
    • http://meweremidef.iblogger.org/music_mixer_and_beat_maker_free.pdfIn PDF document text
    • http://vebejisidag.66ghz.com/android_app_maker_in_lucknow.pdfIn PDF document text
    • https://zotorakiv.weebly.com/uploads/1/3/0/7/130739478/gobokapupujo.pdfIn PDF document text
    • https://figuzejigof.weebly.com/uploads/1/3/4/6/134644002/xelelata.pdfIn PDF document text
    • https://nunavataregexo.weebly.com/uploads/1/3/0/7/130775742/7667b4fab2f.pdfIn PDF document text
    • http://bumomuvo.iblogger.org/84919680212.pdfIn PDF document text
    • http://fukoxonezadanom.22web.org/88130376139.pdfIn PDF document text
    • http://bopokijik.iblogger.org/hermes_parcel_shop_returns_missguided.pdfIn PDF document text
    • http://loberas.22web.org/judobujokumupupul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nifugimifise.epizy.com/76062432415.pdfIn PDF document text
    • http://bewumafovalol.epizy.com/c_r_p_f_ka_full_form.pdfIn PDF document text
    • http://vumijasi.epizy.com/15607146595.pdfIn PDF document text
    • http://sugexure.rf.gd/bar_graph_worksheets_6th_grade.pdfIn PDF document text
    • http://bojonovaja.rf.gd/90841751608.pdfIn PDF document text
    • http://vazorilumi.epizy.com/woxilomidazemiv.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_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 5396 bytes
SHA-256: 238fd86720f370012219b39281fec7ead1661b980494d785ba47e6741a9cc499
font_01_sfnt_off000110f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F0 10556 bytes
SHA-256: 7387e57f8783cdeb5f79ccdce6a3fbeabd41de908c41803ecd758b4e2acd0b04

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