Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fdcf57a2ac377d…

MALICIOUS

PDF

67.6 KB Created: 2021-01-11 17:56:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 52c94ac77b3cde1c026c55da3cd80e87 SHA-1: 851d42bfae197e93eaa2396e9618573a2cb74d19 SHA-256: 83fdcf57a2ac377ddb97ff0942f96330d27030cc7ba18251554212656a667de2
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of 'utm_term=angels+of+death+game' in one URL might indicate a lure, though the document body is heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8050

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.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/aws?utm_term=angels+of+death+game PDF link annotation
    • https://mutazodot.weebly.com/uploads/1/3/0/8/130874237/8d1be.pdfIn PDF document text
    • https://site-1168265.mozfiles.com/files/1168265/96002985955.pdfIn PDF document text
    • https://site-1168130.mozfiles.com/files/1168130/diwokoliwemif.pdfIn PDF document text
    • https://cdn.sqhk.co/sevafeluba/dbgifjc/get_lucky_2019_movie_english_subtitles.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/6519406.pdfIn PDF document text
    • https://petavigavixate.weebly.com/uploads/1/3/4/4/134459614/8269034.pdfIn PDF document text
    • https://site-1176697.mozfiles.com/files/1176697/86712922619.pdfIn PDF document text
    • https://site-1176697.mozfiles.com/files/1176697/20591626995.pdfIn PDF document text
    • https://vezaruve.weebly.com/uploads/1/3/1/3/131378950/fojenof.pdfIn PDF document text
    • https://vewewiganivobob.weebly.com/uploads/1/3/4/8/134852084/93000.pdfIn PDF document text
    • https://site-1174368.mozfiles.com/files/1174368/3348068552.pdfIn PDF document text
    • https://site-1176369.mozfiles.com/files/1176369/60873597533.pdfIn PDF document text
    • https://taruwimogepumo.weebly.com/uploads/1/3/4/3/134331568/79941f52f4f008.pdfIn PDF document text
    • https://menekagamop.weebly.com/uploads/1/3/4/0/134097565/doxeg-zivibis-raxipujenu-tokulowefu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 5216 bytes
SHA-256: cbc86911387478d0de87b1859b5b58e8310f74d4ea498fb8aea46ae7f098aa6f