Malicious PDF — malware analysis report

Static analysis result for SHA-256 50de5f1f7ded40b4…

MALICIOUS

PDF

81.2 KB Created: 2021-01-17 06:48:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 62a48ba850aa19664fed9083c91f79ce SHA-1: 7495a5187a70f186866a853ef22ad29e81c79b41 SHA-256: 50de5f1f7ded40b4ca53a8ea783867ff43f54f6bc27be3bb842a5cdcfc038b58
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or malware distribution lure. It contains a large number of embedded links pointing to various external PDF files hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gettraff.ru/123?utm_term=star+trek+backgrounds In PDF document text
    • https://cdn-cms.f-static.net/uploads/4411922/normal_5f994afbc6029.pdfIn PDF document text
    • https://site-1174356.mozfiles.com/files/1174356/69890341914.pdfIn PDF document text
    • https://bamukozigo.weebly.com/uploads/1/3/1/4/131406799/kopozagojaguxos_wufexuj_soruposofaja.pdfIn PDF document text
    • https://site-1237688.mozfiles.com/files/1237688/nice_guidelines_brca_testing_ovarian_cancer.pdfIn PDF document text
    • https://lafibovuvi.weebly.com/uploads/1/3/4/6/134653173/b0820eab2e952f.pdfIn PDF document text
    • https://nabisafuv.weebly.com/uploads/1/3/1/4/131413222/nawebupibur_kemek_favavoju_tedisimuj.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/iffWDib/gibebisono.pdfIn PDF document text
    • https://cdn.sqhk.co/rejiwosujupa/7rQqCgd/81893126413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_5fa5d06e7f7f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373522/normal_5f96729f6e31a.pdfIn PDF document text
    • https://debaduvevuw.weebly.com/uploads/1/3/4/3/134383420/2426794.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/d8bdf0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 5216 bytes
SHA-256: 2f7e50107ab54aa9144935e9c3d84ae2c93bf57e8a1245c5f8547dd07840f7a1
font_01_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 10908 bytes
SHA-256: 51ce0a1e385cbf773eaecfa1be6aa8319ea89e2edb05a45b111469aa3dddb05b
font_02_sfnt_off000129cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CF 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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