Malicious PDF — malware analysis report

Static analysis result for SHA-256 53579cfd3a4e3a3c…

MALICIOUS

PDF

80.6 KB Created: 2021-01-12 12:47:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0ab772a3c9a8db9d7ad70c42e475613c SHA-1: dfbc871c177d8cac402498e4af67f2843389b6a0 SHA-256: 53579cfd3a4e3a3c3f86f7243c8fca33121852e06980a774036d492bbb8d549b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO manipulation or to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/wb?keyword=chocolate%20buttercream%20frosting%20recipe%20with%20cocoa%20powder PDF link annotation
    • https://site-1178066.mozfiles.com/files/1178066/dingy_meaning_urban_dictionary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490724/normal_5fe882f0e8d85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476418/normal_5fcce3ff998db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381534/normal_5fb39b701a409.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5fc08dd6de95d.pdfIn PDF document text
    • https://midonoguta.weebly.com/uploads/1/3/5/3/135347847/kaligavutiru.pdfIn PDF document text
    • https://site-1173589.mozfiles.com/files/1173589/vlc_android_auto_youtube.pdfIn PDF document text
    • https://site-1201629.mozfiles.com/files/1201629/18817127796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412388/normal_5fc327298b209.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/jasadavebaga/contra_nuevo_orden_mundial_reptiliano.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/72739781947.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/16407222839.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_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 5708 bytes
SHA-256: 96ff8faeb9955a613fd59c1bbb99447b967d756b94f10c794d378632d71b5bc7
font_01_sfnt_off0000fc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 10492 bytes
SHA-256: ea9df311c9b74892869ba7657264bcc340a2c1848a36bc92bd680bf203554c7b
font_02_sfnt_off00012073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12073 16092 bytes
SHA-256: 0be84d2d0547f1f02aa0071b49020aaa73ac7e6a4c4dee27a4da8627c6f2d0ef

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