Malicious PDF — malware analysis report

Static analysis result for SHA-256 a120f629254a08f2…

MALICIOUS

PDF

104.0 KB Created: 2021-01-26 17:34:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d03d3e99f69fa952ba6d8a8736e78b35 SHA-1: 9388149250082ee7a418c31a1ce360a484da1a84 SHA-256: a120f629254a08f21fb9ebd98939766cedd6fb0f845a1b7fb156ac2745c2129a
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 as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a tactic to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=injection+molding+part+design+for+dummies+pdf PDF link annotation
    • http://vukabuv.22web.org/91002044414.pdfIn PDF document text
    • https://turetufifej.weebly.com/uploads/1/3/4/5/134500159/312f48702ff63f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392658/normal_5fff18733592b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471455/normal_5ff0806a260b5.pdfIn PDF document text
    • https://nifatukipukixe.weebly.com/uploads/1/3/1/3/131398430/mazinop-kafasevigeto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476578/normal_5fca8d0e8d183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454559/normal_600e314981cc3.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/21d2754a0d4c051.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462736/normal_5ffe77a1ae105.pdfIn PDF document text
    • http://lisipezasuk.iblogger.org/6822651898.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460954/normal_5fcc7c80a09e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5ff15e35c1103.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385648/normal_5fee101a2e619.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_off000154e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E9 5488 bytes
SHA-256: 87be0f48fbc7a2ba1aa3a8f68b22c59add1f045be017f8f8101f6ac01aa34ce4
font_01_sfnt_off00016784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16784 12664 bytes
SHA-256: 83ab330bd698c1511ab297778286bdeb02a15bf863a8a0a635811ba19d3101b2

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