Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d8ec9a1cead159…

MALICIOUS

PDF

75.6 KB Created: 2021-02-09 22:43:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9aa2adf327ea46b2ac053457c998e5bf SHA-1: 9f54b6d21ea9e1e228da93d25dd7b68cbb8ac7dc SHA-256: 39d8ec9a1cead1591eaa469d3cc4dae2cda9331c932342f3dfaed014caada999
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9717

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://jacksth.ru/aws?utm_term=android+or+iphone+which+one+is+better PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444877/normal_5fd31d227b37b.pdfIn PDF document text
    • http://dibezoko.22web.org/sociologia_politica_libro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449405/normal_60167a1653573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488335/normal_5fd8e0e644a33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386081/normal_5fdd3cf1a937c.pdfIn PDF document text
    • http://fullstacket.online/basketball_stars_unblockedbj1u8.pdfIn PDF document text
    • http://globalsafegroup.com/39062989021v9g0f.pdfIn PDF document text
    • http://nogafadak.iblogger.org/entertainment_trivia_questions_and_answers_2018.pdfIn PDF document text
    • https://lugekovatisemo.weebly.com/uploads/1/3/5/3/135337030/kidinejuxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466398/normal_600631d790476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454277/normal_600ce20c4de69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wawuzir.epizy.com/80799655203.pdfIn PDF document text
    • http://rojavig.epizy.com/bonume.pdfIn PDF document text
    • http://talakukatutevib.epizy.com/ccavenue_seamless_integration_android.pdfIn PDF document text
    • http://mixomexazuvoxod.rf.gd/bisowizotiradajas.pdfIn 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_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 4928 bytes
SHA-256: 328312b98703a571e81aafab55bafbc8d82120525571904bb629f1f27e34e83a
font_01_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 12104 bytes
SHA-256: 50a184e3a13e9e03b43510b3e61f375cbffdf221884b08d27b1e40735ae7fccb

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