Malicious PDF — malware analysis report

Static analysis result for SHA-256 90850990e43e8392…

MALICIOUS

PDF

77.4 KB Created: 2020-12-30 15:08:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 811e853660f9dc9156e8233b618c2a05 SHA-1: 2ac05f19cfa2c8823425fb9b6c338bdfc296dbd1 SHA-256: 90850990e43e83925d3d3a7288349df19576c50c6fdb7f3c32f092045bc4573b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a significant number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. One of the embedded URIs, 'https://traffnew.ru/123?utm_term=google+sheets+regexmatch+not', is likely part of the lure or tracking mechanism. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics strongly indicate a phishing or malicious redirection attempt, potentially leveraging embedded JavaScript for execution.

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://traffnew.ru/123?utm_term=google+sheets+regexmatch+not PDF link annotation
    • https://wexigovepabenu.weebly.com/uploads/1/3/0/7/130738565/5161829.pdfIn PDF document text
    • https://revamimetanezoj.weebly.com/uploads/1/3/4/5/134597499/b45eb37f1b138.pdfIn PDF document text
    • https://sorawujij.weebly.com/uploads/1/3/4/6/134671526/f9d1d3.pdfIn PDF document text
    • https://fikejibin.weebly.com/uploads/1/3/4/3/134331262/xilazofibiboliwu.pdfIn PDF document text
    • https://riwobasafogad.weebly.com/uploads/1/3/3/9/133999818/rolazaxirutiw_xekiriwevugotu_xorofolowutema_fiwagaj.pdfIn PDF document text
    • https://vifefafu.weebly.com/uploads/1/3/4/8/134876142/fatapumadepetax.pdfIn PDF document text
    • https://cdn.sqhk.co/meradipuwiz/kKjgxtN/juwila.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/28632923806.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/zibom.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/raluzagefeba.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/mavujefaganu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 5052 bytes
SHA-256: cf70a147783c900508789093d3bd2c2ceada2403bc81714d4cef4ab8ca9b7f55
font_01_sfnt_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 10552 bytes
SHA-256: 51dd96166054c592aefdbea3cac659ca92dcf62a26e5ab1a05eb6435a6dede73
font_02_sfnt_off00011a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A81 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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