Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f933553015990b…

MALICIOUS

PDF

75.5 KB Created: 2021-03-03 19:14:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8e22531b392ccc6d5804ec00f0706a3b SHA-1: e8a167993878c67195af9f1d33c8c0ba6dfe6768 SHA-256: 16f933553015990b213fb1aadab1fe47bf71b3bd3de25f89132d6e3f1ee69e89
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also flagged the PDF with high confidence. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool rather than being a legitimate document. The presence of redirector links strongly suggests an intent to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=seventeen+mbti+test+results In PDF document text
    • https://cdn-cms.f-static.net/uploads/4486742/normal_5fd7bd04eefd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413007/normal_5ffa0130eb6fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408879/normal_600b5c4055b48.pdfIn PDF document text
    • http://rofuxipof.mywebcommunity.org/36007085219.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379476/normal_5ffd77c6cd44a.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/lamborghini_gallardo_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_5fd9c54ccfad9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483837/normal_5fe5eb8fae8b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bagineju.epizy.com/juvuket.pdfIn PDF document text
    • http://rinexevijexaxi.epizy.com/maritisuxuzibirojozi.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/best_photo_editor_online_for_android.pdfIn PDF document text
    • http://vifowas.epizy.com/wepusoz.pdfIn PDF document text
    • http://bedawisanono.epizy.com/kukoteli.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_off0000ebf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 4924 bytes
SHA-256: e3c6c3b7abb3d1c53e146ba85c30d3b5e6d1e068f9c6be321cf68e002c3294a2
font_01_sfnt_off0000fca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA6 10772 bytes
SHA-256: d23502e3172a145a186566bccd19e5839afb55f384383ea35115dc5114c71b03

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