Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7b3b71968d52df…

MALICIOUS

PDF

68.0 KB Created: 2021-01-06 03:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8a94a4cd458debed0e081ec3c45d188d SHA-1: 02e2494277faa137761953dba447c120282b8d5e SHA-256: 3e7b3b71968d52df40cd51cff67e8a2b8e52ee147fc5a465ae53d6e3df9fb0cf
214 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, appears to be related to search engine optimization (SEO) link farming, suggesting an attempt to manipulate search results or drive traffic to malicious sites. The presence of multiple external PDF links further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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/aws?utm_term=what+is+pennywise+true+form+reddit In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379359/normal_5f8b80cad0145.pdfIn PDF document text
    • https://pinukavuzufov.weebly.com/uploads/1/3/4/3/134307945/3084343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f87f7e6165e1.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/jcAjaig/50273184940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5fc3409dc0055.pdfIn PDF document text
    • https://fimupekegu.weebly.com/uploads/1/3/4/5/134502303/dedasunuligegilunep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_5fd28c690ef01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457563/normal_5fa4a245083be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413118/normal_5fe50e4666281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388183/normal_5fad453018bce.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
    • https://uploads.strikinglycdn.com/files/6af50b36-5926-4cf7-810a-e044d74ea4d7/67093865652.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC038 5336 bytes
SHA-256: 299fe5bca013686d37e7cbc5a8edd341c9931a2cb46e41e176be3ea7d689d744
font_01_sfnt_off0000d246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD246 10060 bytes
SHA-256: c5b0bbf6e6a16b5435846ab054ed7d7e51db3b8aafe035b2c0d60aab79f94b1b
font_02_sfnt_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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