Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ed5f5fd90c3bf2…

MALICIOUS

PDF

86.3 KB Created: 2021-02-09 22:33:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7cef699a4e0a652f387f2d570fcd14de SHA-1: 263837ba653890cef2c0996b8abb3dd449ea9f3f SHA-256: 88ed5f5fd90c3bf24634d9541041608e8c8c5c04ed2d418fea3070192a63f711
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. ClamAV also detected this file as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the presence of numerous external URLs and the nature of the heuristics strongly indicate malicious intent, likely related to directing users to malicious content or phishing sites.

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/aws?utm_term=resistant+hypertension+guidelines PDF link annotation
    • https://wesuzekubiw.weebly.com/uploads/1/3/1/6/131607103/87d7c5a64f.pdfIn PDF document text
    • http://glawerry.online/namujusikafuxuwlhpol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494149/normal_601b13b4710a4.pdfIn PDF document text
    • http://prod-fruit.space/kifagavuboxobebuzinmpcc6.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/90616379a5c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422392/normal_5fc5a1e536419.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411001/normal_5ff97f49268f2.pdfIn PDF document text
    • http://tamakar.xyz/hollywood_movies_alien_covenant_2017vfek3.pdfIn PDF document text
    • http://bestrongbyg.com/8811982726335sx5.pdfIn PDF document text
    • http://ladidoxa.iblogger.org/mebofujikoxuwuwore.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427295/normal_5ffba6bc2df21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476756/normal_5fc5cbde1216c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475863/normal_6012e3b40e41c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492281/normal_6009e81f83716.pdfIn PDF document text
    • http://taygerr.com/banque_du_caire_annual_report_2018nsoj4.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AB 5328 bytes
SHA-256: 617cba40f64f51a6e14695bf1586a6ad25b3f1a0eca043d0661ac555c6be371b
font_01_sfnt_off000123cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CF 12260 bytes
SHA-256: 6c7abf1f7d5dc0efebfda3400b1cfe7fb180dc808df050c42483bf2fb57f00d7

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