Malicious PDF — malware analysis report

Static analysis result for SHA-256 4805b8b3d0819582…

MALICIOUS

PDF

68.9 KB Created: 2021-05-28 23:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e0e2381b402469d87a040d4b1d62488e SHA-1: d8c7940d9f77c041740680890f4eddb487b183fc SHA-256: 4805b8b3d081958279f64b1be5bffaa839c1820121a67c3303593acc619f4938
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed to direct users to external sites. The primary malicious URL identified is 'https://leonvi.ru/strik?utm_term=accounting+information+system+pdf+romney', which is likely used for phishing or to serve a second-stage payload. ClamAV detection as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' further supports its malicious nature.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://leonvi.ru/strik?utm_term=accounting+information+system+pdf+romney PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465015/normal_6044d6b8a3cd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470677/normal_5fee716c01775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_6061708bc8d76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368750/normal_6010aa2ae6c1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_5feaed0d30455.pdfIn PDF document text
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/ninowiwemibuzewolip.pdfIn PDF document text
    • https://vufikodimaduxi.weebly.com/uploads/1/3/1/0/131070035/08d892d.pdfIn PDF document text
    • https://nulesurusisozi.weebly.com/uploads/1/3/4/7/134744420/lomagutobom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445754/normal_5fe3d91eac8eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498893/normal_602fcdb7939ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387590/normal_60391870df643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486552/normal_602b7253ad36b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9721945-8e87-430f-addf-7ff55fbe0bad/pazutofofutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4954d7-9aa7-472a-a6b0-0893c5bd0589/jamelivupibegipinel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30911e1d-c205-4c32-b66d-ed992e56aa22/18375176776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42ed5c7f-53a5-440f-b786-7b2e5f7ae15c/java_jre_8_update_271_64-bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206b99e5-8562-472a-af5c-10edc8b3fb11/1316072974.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_off0000d136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 5536 bytes
SHA-256: 95ebddcfbc6ef55ecc9564b66d4b3597aea584e7c7886fc64781f7301bf1614f
font_01_sfnt_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 10152 bytes
SHA-256: af22739cf789d62969e46df4c0ecfd847a7ebbd4548d26e340c348fd6fe628b7

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