Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e6b533b31455095…

MALICIOUS

PDF

66.4 KB Created: 2020-12-21 04:42:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99a770753a39c6b8d542c5a7519797af SHA-1: 6a448ffb4d20fe53f23cfb7ce28e9142bb5cecf1 SHA-256: 5e6b533b31455095fec6cd6406471f75f3347e34167c5c89ba36494b17a68ff4
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a malicious URL, which in turn leads to a link farm of other PDFs. This behavior is indicative of a phishing or spam campaign designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=love+quotes+for+him+in+spanish
    • https://cdn-cms.f-static.net/uploads/4415740/normal_5fbc88b5cc06c.pdf
    • https://cdn-cms.f-static.net/uploads/4369182/normal_5f8a2c86cf652.pdf
    • https://cdn-cms.f-static.net/uploads/4462056/normal_5fdb6286e5049.pdf
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/folexidijok.pdf
    • https://bepugodaz.weebly.com/uploads/1/3/4/2/134236138/mixaziz.pdf
    • https://xewiriwi.weebly.com/uploads/1/3/4/6/134645045/bokojorokalaw.pdf
    • https://cdn-cms.f-static.net/uploads/4377678/normal_5fa6c2d29cdbd.pdf
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f87a7491dcde.pdf
    • https://gegixigozazewit.weebly.com/uploads/1/3/4/8/134858275/e599b4a72310.pdf
    • https://static.s123-cdn-static.com/uploads/4484994/normal_5fc3fb5287a7d.pdf
    • https://bowotile.weebly.com/uploads/1/3/4/7/134759747/2981427.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e0511f50-7825-42b3-83b4-49be781a4316/dar_state_forest.pdf
    • https://uploads.strikinglycdn.com/files/ce087d09-cfad-4434-8c0f-19bfab99c95b/potomebu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c711.bin
7466196f3a23b71eeedc0935f66a8b1ef7e2aae199a4a1082c768bdb9adafc10
pdf-font-stream PDF embedded font (sfnt) at offset 0xC711 5236 bytes
font_01_sfnt_off0000d8c4.bin
4e547b0cb47305a5d3927647e858ebe77f40f53b9724033dae307701b2fdfebd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 11132 bytes