Malicious PDF — malware analysis report

Static analysis result for SHA-256 755234b0ac2112c1…

MALICIOUS

PDF

65.6 KB Created: 2020-11-20 00:58:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 93d7f235bf0319c8b525488c97553414 SHA-1: 5fca1b7a8f5e924ce72a9b247c7220545e9c895c SHA-256: 755234b0ac2112c10ba633b419bb0887b6848b90fb39bbdff172fbf8421c5ba9
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to drive traffic to various sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

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 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.
  • 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://traffine.ru/strik?utm_term=pin+evolution+guide+twewy In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413973/normal_5f987f0baeea7.pdfIn PDF document text
    • https://jurexufibemoso.weebly.com/uploads/1/3/4/3/134310147/rizumibevumo.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/nivatizadukodisu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368999/normal_5f928f55bdc7c.pdfIn PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/teramonimavepaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380536/normal_5fb6efd998cf5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f9e43168ca61.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/zirojopemup/4545740298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71b9e20c-ca8e-44ff-8ee9-435a94b745b0/phoenix_wright_cases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb31f8bf-1a95-47d0-b8bb-230a05ab3ced/fizop.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/almacenamiento_en_la_nube_definicion_informatica.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_off0000c523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC523 4764 bytes
SHA-256: d397e5c42165470b0c49a0806f9467ff0b02e73662e380c879c35fd104e495ac
font_01_sfnt_off0000d586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD586 10596 bytes
SHA-256: 4b287cba8d0dc5d2a12918e4764b432d150b405d19be63920457c548913506fd

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