Malicious PDF — malware analysis report

Static analysis result for SHA-256 b415b933bd5a1998…

MALICIOUS

PDF

76.3 KB Created: 2021-03-04 09:54:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: f5f8c7b10fbda0e81ebed999d8a1bbb3 SHA-1: 56070b2bdbaf2a6d022c6d53459518419aa21332 SHA-256: b415b933bd5a19989a88023895760dc46370f0e73abc80a265b7ce4d6509848b
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the PDF structure indicate it's likely used as a lure 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://resalured.ru/wix?keyword=digiorno+stuffed+crust+pizza+cook+time PDF link annotation
    • http://supijijuzumapiz.iblogger.org/plagiarism_checker_x_originality_report_descargar.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/signs_of_life_in_the_usa_9th_edition_citation.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/sigusukusewabalukodew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367308/normal_5ff2fa139ec50.pdfIn PDF document text
    • http://digtalcaliper09.xyz/15967174311s063l.pdfIn PDF document text
    • https://naxaletuzo.weebly.com/uploads/1/3/4/5/134508506/xaruxik-luxusenadumavef-diwogalefiv-gadojipobiguvap.pdfIn PDF document text
    • http://pokemonrivals.online/what_is_synthesis_in_research1s6p4.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/zunamazisepetububol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459623/normal_6006cce3b9210.pdfIn PDF document text
    • http://lazirog.mywebcommunity.org/sinner_in_the_hands_of_an_angry_god_imagery.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416151/normal_5fd651ea34260.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/2599510.pdfIn PDF document text
    • http://4338bacchus.com/wings_birdyf97dz.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/643690856937gkwp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://seroroxunabolu.onlinewebshop.net/82687367994.pdfIn PDF document text
    • http://zobovobewuw.epizy.com/29594757242.pdfIn PDF document text
    • http://fezibebub.rf.gd/roludowevilaguraru.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_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 5556 bytes
SHA-256: 7a260b6a4d58534d50d71728a56d22ccceff6a03b4b2b2deb2e5ce5ab32471d8
font_01_sfnt_off0001013f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013F 10112 bytes
SHA-256: 334d59a8170426262c00b4b4369532ef045be954d07e9f60f03f4f52ea96308f

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