Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea23e74aef6e4f9…

MALICIOUS

PDF

85.5 KB Created: 2021-03-26 18:42:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d84d2657e9b24f2e841a6722fee8b9d2 SHA-1: 9e06dd470721c4b89032d779a9beb80d2fc28fe4 SHA-256: 4ea23e74aef6e4f91a452aef2b497f306b6c7a8fb9f9e013299e1afbd9221a83
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/123?utm_term=android+open+world+action+rpg PDF link annotation
    • http://dotekebenutedex.scienceontheweb.net/dave_and_busters_menu_prices.pdfIn PDF document text
    • https://wojumujar.weebly.com/uploads/1/3/5/3/135396772/b56c9a3f0a.pdfIn PDF document text
    • http://biomanua.website/64945729883nfy8q.pdfIn PDF document text
    • http://visiblawty.com/72233311976zowd4.pdfIn PDF document text
    • http://jakusavu.sportsontheweb.net/naxek.pdfIn PDF document text
    • http://pimavegi.22web.org/after_effects_free_for_windows_8._1.pdfIn PDF document text
    • http://fonivoguko.medianewsonline.com/furototize.pdfIn PDF document text
    • http://belkwigs.com/811091736456p3dj.pdfIn PDF document text
    • http://lexamopelezun.mywebcommunity.org/xuletej.pdfIn PDF document text
    • https://tunivarururi.weebly.com/uploads/1/3/4/0/134041149/8586101.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/zixotegaxawavij.pdfIn PDF document text
    • http://kuxixatizoxop.epizy.com/1028415542.pdfIn PDF document text
    • http://lenisemi.epizy.com/gugopatug.pdfIn PDF document text
    • http://mafilijesov.epizy.com/lumenofapi.pdfIn PDF document text
    • http://koziviwuvep.epizy.com/77248882214.pdfIn PDF document text
    • http://sedozod.rf.gd/jubuvamosofedewo.pdfIn PDF document text
    • http://pawuzax.onlinewebshop.net/82905886889.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/44149447605.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/eusebius_church_history_greek_text.pdfIn PDF document text
    • http://pibasas.epizy.com/fowarebokubilenajeragabad.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCA 5144 bytes
SHA-256: 01481c0c94b7a1b1b661227f818640f556b8039fe197d55296c71b5319877a18
font_01_sfnt_off00010e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 10596 bytes
SHA-256: e33eec117fc1bbab787e1ef50935880833be1efd5f8dd386f9cd00e7be683eea
font_02_sfnt_off000132e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E7 16152 bytes
SHA-256: 70180b97a9b9fe0de1e0c05b06d733d04658c9f7a2923a3eee6842afe753d47e