Malicious PDF — malware analysis report

Static analysis result for SHA-256 282d9a855ab30fd3…

MALICIOUS

PDF

83.9 KB Created: 2021-01-14 07:05:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 536696f91e9e3499bc2484ac078c5d64 SHA-1: e40d07a51b4ac9611f7625f9d3ec41fcacd21683 SHA-256: 282d9a855ab30fd3403b8d6f9ff49e9f35682263bbc19a435f39d6c605dd7045
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffking.ru/aws?utm_term=aerith%2527+s+theme+piano+collections+sheet+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393353/normal_5f9753de45e69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470977/normal_5fd9ab7a7d5bf.pdfIn PDF document text
    • https://vadulovoke.weebly.com/uploads/1/3/4/3/134338980/2261856.pdfIn PDF document text
    • https://site-1173381.mozfiles.com/files/1173381/41631651113.pdfIn PDF document text
    • https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/kunubixeges.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469837/normal_5fa6278a3abde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403817/normal_5f98fc34c34dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490272/normal_5fdd59c19c734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370764/normal_5fa808dcdea20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_5fb2a3996d7d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455894/normal_5fcb48acede46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5fd237bd3ac28.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/vutame/7083247357.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/best_battery_calibration_app_for_rooted_android.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 5196 bytes
SHA-256: 623b28e8ece908305e4d73258a2344ef95946fdddec6649fa3bab6889f2f76bd
font_01_sfnt_off0000e687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 11676 bytes
SHA-256: e50d089840ac8ee942c6a9f9a9771a8bede8312af47b973c7a3924c09cf02ce6
font_02_sfnt_off00010e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6E 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off000123d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D8 9268 bytes
SHA-256: 844a87c834180c5d42d6e5ff33d5f21aecda3d476709324652c9fdb4624028ba

Open this report in the interactive analyzer, or submit your own file for analysis.