Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5312815cf641bae…

MALICIOUS

PDF

72.1 KB Created: 2020-11-11 05:22:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c7f6001956b3f0332848c4bc0cd3bd21 SHA-1: 8be076566749317f33d7f296864ac8d219ea5aa5 SHA-256: f5312815cf641bae85dec7dd0fc5c1c8bdffeddb639cf84b6351b2e857563bdd
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains text that appears to be a lure related to educational materials.

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://traffnew.ru/123?keyword=chapter+5+test+form+2c+algebra+1+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426543/normal_5f99ec54960cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_5f8cb6e4858bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f8a79288dd32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415739/normal_5f9c935c2b6cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f89497ae8d1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f8765acb98aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_5fa8bdc284ccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366375/normal_5f891d861dd11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388063/normal_5f966c5286065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_5fa78cd82b0e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421339/normal_5fa5b9e68f24f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5f885f2403e02.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/tadovu/74209056670.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/37605966746.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CD 5876 bytes
SHA-256: 7ec7a0859a1b73e27af92d976b2b801586e556a4b82b5ba55cdcf74341415d11
font_01_sfnt_off0000d7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B9 11300 bytes
SHA-256: d9800ceed3dba04100173015ac5dce75f03542ab5cce9cb529a8f717963d2ada
font_02_sfnt_off0000fe66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 16072 bytes
SHA-256: 062f8a7185608a18dbd56baf48eb14c791e3c6ea8866a2ddd6a03467109098f1

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