Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6913666dbd7e862…

MALICIOUS

PDF

56.8 KB Created: 2021-02-18 20:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5d849e20422d3df0c54af4845f1c313c SHA-1: 612b1d9d5c640a63a75e087ea2a2f71410ee3fac SHA-256: a6913666dbd7e8621baf01085d4535524ec21462b2faf426fe1422ea62b26e46
242 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains a large number of links to external websites, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'crophysi.ru' as a known malicious redirector. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the document's structure and embedded links strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9630

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
  • 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.
  • 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://crophysi.ru/strik?utm_term=brother+hl-3170cdw+not+printing In PDF document text
    • https://gebijodefilamoz.weebly.com/uploads/1/3/1/4/131406109/sedonirenuze.pdfIn PDF document text
    • https://vomuxetajamusu.weebly.com/uploads/1/3/1/8/131857717/panurotogi.pdfIn PDF document text
    • https://vunadonugo.weebly.com/uploads/1/3/1/0/131070983/nawepidaxejavedageru.pdfIn PDF document text
    • https://namunobuwuper.weebly.com/uploads/1/3/0/7/130776476/xomasuwura.pdfIn PDF document text
    • http://fly-drive.online/xapekaripapesiduebxkr.pdfIn PDF document text
    • https://tejalegevususo.weebly.com/uploads/1/3/1/6/131637178/1726212.pdfIn PDF document text
    • http://bomezifubaf.iblogger.org/ask_and_it_is_given_scripture.pdfIn PDF document text
    • https://farisogu.weebly.com/uploads/1/3/4/3/134307724/38df1e35.pdfIn PDF document text
    • https://denosofebulapan.weebly.com/uploads/1/3/5/3/135347567/darup.pdfIn PDF document text
    • https://nuwaruwavup.weebly.com/uploads/1/3/4/3/134362645/2383756.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/oPRjdjf/15764615727.pdfIn PDF document text
    • http://autoport76.online/mopigotatafukojukuroletus8v3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pekoguwomigurup.epizy.com/numufob.pdfIn PDF document text
    • http://zozafiromilofin.epizy.com/certificate_attestation_letter_format.pdfIn PDF document text
    • http://jufofokisib.epizy.com/caecilia_lt_std_font_family_free.pdfIn PDF document text
    • http://vapedefomagejev.epizy.com/kdigo_guidelines_ckd.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE52 5556 bytes
SHA-256: 5e75ff9465ee4951d8d7dfa5b67140f70244eafa8b1921a1a81a1a6395399074

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