Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4993aa645932242…

MALICIOUS

PDF

73.3 KB Created: 2021-02-15 20:13:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0bf97a1e13b5d4f91a29c82751d1b65b SHA-1: f3f4ea439b7bd4803e0069800fcba7e05ff39d6d SHA-256: d4993aa6459322424a6be83da83eb6e002a0fb2beb0fda58981d26a5e3a337c3
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL `https://jottigo.ru/123?utm_term=how+much+does+a+delta+flight+attendant+make+an+hour` suggests a phishing lure related to salary information. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/123?utm_term=how+much+does+a+delta+flight+attendant+make+an+hour PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489730/normal_602a846dc0ef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470389/normal_5fe82e327d95a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408864/normal_5fffa1a2ae2b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427499/normal_5fe3e400e78b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466680/normal_5fc715892d2d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415745/normal_5fd9e64f6fefa.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/IZiihbZ/koruxijatufinagameko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483075/normal_5fdf7201499e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389816/normal_5fdfc8a72b6b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423188/normal_6029dbd84fba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391335/normal_601cc43219df2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407724/normal_6003ce72c3721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445564/normal_5fdadae301846.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505839/normal_5fedf4c152a4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5fd32aa77d3f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369926/normal_5fe568636126e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lososimap/valel.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_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 5552 bytes
SHA-256: 9c188c8b10d90dcd07ca9963c2b0d13ac7b4bd854099267c262a91414341b19b
font_01_sfnt_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 10796 bytes
SHA-256: e09451bd73ca7fd07809c19e016077bfb4e2de74e6e6aec7d4d664b1792a9dbd

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