Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61912e85e080619…

MALICIOUS

PDF

83.2 KB Created: 2021-01-25 07:29:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5658c063c2e04526be87ffa39d372ce4 SHA-1: 1d5341b57db9301ce67fffbc8c8cdba506639abb SHA-256: d61912e85e080619673c77d0dbb77b5ecffe972044b8414d245a3018ff00bab3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign-looking PDFs, but one critical heuristic identified it as a 'PDF_SEO_LINK_FARM'. This suggests the document is designed to appear as a resource hub while likely distributing malicious content or redirecting users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature, indicating it's a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=bedford+middle+school+football PDF link annotation
    • http://velavedi.iblogger.org/pivepenuxuzatamafida.pdfIn PDF document text
    • https://donurufeto.weebly.com/uploads/1/3/4/8/134898164/letetemurotazibe.pdfIn PDF document text
    • https://rorefodelubo.weebly.com/uploads/1/3/1/4/131452934/mexute.pdfIn PDF document text
    • https://sebiwijojemobod.weebly.com/uploads/1/3/4/0/134097571/tenijuraruzel_lefavuje.pdfIn PDF document text
    • https://veximukexapi.weebly.com/uploads/1/3/0/9/130969798/6397557.pdfIn PDF document text
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/pulomawad.pdfIn PDF document text
    • https://fizinizaboz.weebly.com/uploads/1/3/5/3/135304720/rugekuzises.pdfIn PDF document text
    • http://sexapixir.22web.org/32414455231.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/moduluzuxikari/linear_equation_slope_intercept_form_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/best_cheque_printing_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/84027512276.pdfIn PDF document text
    • http://rowisumemosil.rf.gd/winrar_archiver_for_windows_8.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/juralufosopaxevifolufu.pdfIn PDF document text
    • http://waromewozepivo.rf.gd/electronic_press_kit_template_website.pdfIn PDF document text
    • http://xonowazibekaz.epizy.com/json_formatter_plugin_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/movies_sites_for_mobile.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_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 5452 bytes
SHA-256: 4870badbc1c4ac1449840c11ea261a497ef8681bd314aa44f454454ab15f0c48
font_01_sfnt_off00011c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C48 10432 bytes
SHA-256: 4721dcd47cb2bf26bc0cbd117c60c756c72b1e7a2b1b6457e7c201470a3465d2

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