Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfe2cdc37b0e68a…

MALICIOUS

PDF

66.4 KB Created: 2021-02-21 18:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1a510d933555d221a89a9e8aacef2df1 SHA-1: bd6657fa340d50cf39a70bfc291534be7d52e02d SHA-256: 7bfe2cdc37b0e68acc19834a85d287d338d0f65706cd520babe3141dad9c0e9d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The PDF contains a large number of external links, many pointing to suspicious domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains text related to a workbook, which is likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=integrated+chinese+workbook+pdf+level+1+part+2 PDF link annotation
    • http://piwubexugapi.22web.org/gomup.pdfIn PDF document text
    • https://morisefomu.weebly.com/uploads/1/3/0/9/130969566/8027414.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/suxuzubojut/59362088933.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/ladolevu.pdfIn PDF document text
    • http://kenabemaborok.rf.gd/wamuza.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/file_from_slack_iphone.pdfIn PDF document text
    • http://godemesefiw.epizy.com/horror_movies_mp4moviez.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/whatsapp_status_tamil_hdvidz.pdfIn PDF document text
    • http://wowulikuvej.rf.gd/wovufasomizutuwinoja.pdfIn PDF document text
    • http://zavujosabojid.rf.gd/final_fantasy_7_ps4_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/77895496915.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_off0000c53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53E 5896 bytes
SHA-256: dd7ff852c9a307b95e557de0311c19200bbdf0a37448721fe7d86c7d06b73d95
font_01_sfnt_off0000d96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96E 10292 bytes
SHA-256: 8f24dbd29126d96403a709a3fbc4fc1e949a7abf92033a20530d4c62505aa624

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