Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4d2fea2e4c3f56…

MALICIOUS

PDF

68.1 KB Created: 2020-11-27 03:07:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: efe37f190ca863c0e542282ab4e5f574 SHA-1: 196c776f3ce12aebfc811784ce93e81fdb22a92a SHA-256: 6b4d2fea2e4c3f56bff01da28bbccb1fb1a1feb9e27f6b2a38d07bd42beee41a
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, with one specifically identified as a malicious redirector. The presence of numerous external links suggests an attempt to manipulate search engine results or direct users to phishing sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://traffmen.ru/123?utm_term=drawmij%2527s+instant+summons In PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_5fb52da88dadf.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/c5f5b7d395e978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421214/normal_5fbcf63f98fff.pdfIn PDF document text
    • https://kunimagim.weebly.com/uploads/1/3/4/6/134608209/pikogavodomomos-xuvukek-selogepifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5f94e04894154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451208/normal_5fbe9f26a7c1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458161/normal_5fa99b2d26356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481839/normal_5fad75cb8cca7.pdfIn PDF document text
    • https://kipujoguburaza.weebly.com/uploads/1/3/4/3/134321983/5669880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392867/normal_5f973ddccc825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_5fbaac845c861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417138/normal_5fb9c16a19817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_5fb2afaa9cc94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_5f9f4272bf978.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA3 5000 bytes
SHA-256: c260554b092a07edf3522549d5fcb6ad0620ccf5ba0c584aa7ad3b0b02f14f02
font_01_sfnt_off0000dea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 10824 bytes
SHA-256: 1c7a8c719899bd43b94ee6ed12abc9e67fc99a73be7539410d3ea4f3beca44d3

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