Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfc0dba048fe39e…

MALICIOUS

PDF

82.4 KB Created: 2021-01-18 14:01:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d4dc727c4138ce5c11c242c503453f92 SHA-1: 21f48628263bc0da9b20c40db21a5dce2c5d4c73 SHA-256: 7dfc0dba048fe39edd0ab8fe13d0f12d5df08544256969606ed3d803c6fb7f73
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an effort to direct users to potentially harmful external content.

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://traffset.ru/123?utm_term=worldedit+brush+replace PDF link annotation
    • https://site-1174959.mozfiles.com/files/1174959/lifulezizumegeti.pdfIn PDF document text
    • https://gonerogad.weebly.com/uploads/1/3/1/4/131438616/tiviwisomevenu.pdfIn PDF document text
    • https://site-1205711.mozfiles.com/files/1205711/53507976562.pdfIn PDF document text
    • https://site-1179526.mozfiles.com/files/1179526/mejaraniropunolinonazilis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470692/normal_5fcbfdeee6dbf.pdfIn PDF document text
    • https://biwilodumiz.weebly.com/uploads/1/3/4/3/134319983/5906620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416128/normal_5fc0fe7364306.pdfIn PDF document text
    • https://site-1229446.mozfiles.com/files/1229446/android_studio_emulator_old_version.pdfIn PDF document text
    • https://site-1166064.mozfiles.com/files/1166064/14948440461.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/bisute/savelefiropuvutavaneliz.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/teechip_scam_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/37370615794.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/82379518908.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_off0000fea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA8 5312 bytes
SHA-256: f09d7e39a8822488a70e741e5808c243d69abe7aac132c2cb98d7b915a574df5
font_01_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 12904 bytes
SHA-256: 909c771a93036a6d45269827cba6de31fe36cb91448413e896211b8ec12635f8

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