Malicious PDF — malware analysis report

Static analysis result for SHA-256 4918065a6ad7ddd2…

MALICIOUS

PDF

74.6 KB Created: 2021-03-29 14:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ddb9705ee4bd7247c45fe077f2d140f6 SHA-1: 248be4924fc2a66a3fcd09e27d18d46cfd2f86f6 SHA-256: 4918065a6ad7ddd2bafb1a66695fbc69fda5b07d5ae3c64adf3c7fd000084c46
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm designed to redirect users, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xajibur.ru/123?utm_term=soccer+jersey+design+template+free PDF link annotation
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/71e32.pdfIn PDF document text
    • http://tevejovevufosis.22web.org/cinematica_fisica_exercicios_resolvidos.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabudoxuwa/iieFOLC/xiniduxikasatuf.pdfIn PDF document text
    • http://pupijepu.22web.org/power_book_2_netflix_release.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/factoring_binomials.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/39789981089.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/EO8icVY/tibufenunoneku.pdfIn PDF document text
    • http://kalukawuwo.mygamesonline.org/8208914550.pdfIn PDF document text
    • https://lelunoforonu.weebly.com/uploads/1/3/1/6/131606056/1588468.pdfIn PDF document text
    • http://jemulobapamiwu.mywebcommunity.org/36792098351.pdfIn PDF document text
    • https://zujefimobob.weebly.com/uploads/1/3/1/4/131453463/widakegavudo.pdfIn PDF document text
    • https://fujovufizopi.weebly.com/uploads/1/3/2/7/132710671/6640437.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/hp_photosmart_2610_manual.pdfIn PDF document text
    • https://weligolujevis.weebly.com/uploads/1/3/4/7/134748453/zubadupukiligowi.pdfIn PDF document text
    • http://zaxunux.iblogger.org/22823372851.pdfIn PDF document text
    • http://lonotel.mygamesonline.org/acetonitrile_msds_merck.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://timagugovoxo.onlinewebshop.net/nogupebejotos.pdfIn PDF document text
    • http://nebovorem.epizy.com/best_portable_android_emulator_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/semuxemakaw/phpmyadmin_blob_file.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/acupuncture_anesthesia_points.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/2252626750.pdfIn PDF document text
    • http://fijukarevi.epizy.com/66621647087.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_off0000e52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 5756 bytes
SHA-256: f4da3829791630dc9b8a62691ef16caa6523816d8049d7c7435166d321c28d8a
font_01_sfnt_off0000f8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BF 10528 bytes
SHA-256: d6beceac3551aa069fd95e3c6f318d3cefa51ab1642f77f2b42c8ba3ee013758

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