Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d7046bec0bfd61…

MALICIOUS

PDF

72.5 KB Created: 2021-02-25 15:59:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2e953dbcceba76b11126cfce1a8dfd4a SHA-1: f541d7cd0f2c755f57840addf190d43b2643d185 SHA-256: 31d7046bec0bfd61360f45a8db008d9cf2ebc435bdf9c14cae576445cc8be7cb
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document body, though heavily obfuscated, contains a URL that appears to be a search query, suggesting a lure to a link farm. The presence of multiple external URIs and a link farm heuristic further supports this. No scripts were extracted, but the PDF structure and heuristics point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wb?keyword=how%20do%20i%20get%20my%20art%20noticed%20on%20instagram PDF link annotation
    • http://dakisemakegag.sportsontheweb.net/what_is_dataset_object_mcq.pdfIn PDF document text
    • https://warubexe.weebly.com/uploads/1/3/4/6/134647576/perugasol.pdfIn PDF document text
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/tujidef_xiditewi.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/the_odyssey_fagles_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/8xmjzDK/star_wars_a_new_hope_opening_crawl_script.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/what_city_is_babylon_today.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/physics_equations_of_motion_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/lewiwifo/Xghjg4U/78586225828.pdfIn PDF document text
    • http://tekufebuxu.iblogger.org/4355818752.pdfIn PDF document text
    • https://lolimoxozidexus.weebly.com/uploads/1/3/2/6/132682882/tiberaben.pdfIn PDF document text
    • http://wavasesinile.22web.org/kuripizovozubuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dewabop.rf.gd/lord_of_the_flies_chapter_1-3_quiz_answers.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/32644251596.pdfIn PDF document text
    • http://zaninoj.epizy.com/breast_cancer_screening_guidelines_europe.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_off0000de52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 5380 bytes
SHA-256: dbbf1887fa6b29e002072a30c2013327225dd0789111a104250dab41c6f912af
font_01_sfnt_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 10696 bytes
SHA-256: cd1ecb9a4b2ef10721a0282ff85e9bf28b42edf152b48d12cb5af2fc3e13b7fc

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