Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36b720ca6125bee…

MALICIOUS

PDF

75.1 KB Created: 2021-01-13 02:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7b9da3ac1b7305976083bc1fb69b7f31 SHA-1: d9cebeef0a451db33fa8f19164887928483bbfa0 SHA-256: c36b720ca6125beeb6f2c2c0ab17a15c9aef17b771f00aaff2c754ed4df1516f
244 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/aws?utm_term=carbohydrate+chemistry+textbook+pdf In PDF document text
    • https://zoxofaduw.weebly.com/uploads/1/3/2/6/132683138/106383.pdfIn PDF document text
    • https://zijananuwale.weebly.com/uploads/1/3/4/4/134438714/15e9ca9.pdfIn PDF document text
    • https://site-1177862.mozfiles.com/files/1177862/29264558928.pdfIn PDF document text
    • https://rumikupim.weebly.com/uploads/1/3/5/3/135310872/soroxowajig.pdfIn PDF document text
    • https://memebewaliz.weebly.com/uploads/1/3/0/7/130775997/e344cfeb.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/gezumuwavizegekis.pdfIn PDF document text
    • https://wumevevevusawu.weebly.com/uploads/1/3/4/3/134388399/5853562.pdfIn PDF document text
    • https://cdn.sqhk.co/tatiwurixiwo/bjgVic0/fozufisuwedopuli.pdfIn PDF document text
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/tudazanumabawag_gevaso.pdfIn PDF document text
    • https://sirowatogiwu.weebly.com/uploads/1/3/2/8/132814809/899b72fa7.pdfIn PDF document text
    • https://site-1177606.mozfiles.com/files/1177606/the_trip_to_italy_movie_review.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/gd2hghy/2012_zombie_apocalypse_movie_trailer.pdfIn PDF document text
    • https://daxusumupazi.weebly.com/uploads/1/3/4/7/134702932/4b2ae50c0764.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/winumigutam/52001875016.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/44439985451.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_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 5644 bytes
SHA-256: 936f3509d7431164cc74e24c09116915145e8ecd29daf31b9d793bfbc8d73838
font_01_sfnt_off0000fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 10584 bytes
SHA-256: 394f1458375420ad1da846a9de0ae5f493959457aa273480c0bbd4c1563ebdf3

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