Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f5f12fbb6a9820…

MALICIOUS

PDF

59.9 KB Created: 2021-02-24 20:28:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9c7538c7ebb691f4bd3196f706956088 SHA-1: 0587eb451e14f01816a9d3b1503c6ec034464a7a SHA-256: 97f5f12fbb6a9820ba80d5a311e3db932dca53b191e784a4afcc4b8c0f62f2f1
224 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to disposable hosting or suspicious domains, suggesting a link farm or phishing lure. The presence of an invisible link to 'http://securityofusersdevicesonline.site/452374970540vavs.pdf' further supports a malicious redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

Heuristics 6

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://seumenha.ru/award?keyword=flute+etudes+book+mary+karen+clardy+pdf PDF link annotation
    • https://fujerituzaxu.weebly.com/uploads/1/3/0/7/130775231/gabojafa_wugifikadunafaz.pdfIn PDF document text
    • https://cdn.sqhk.co/lebapivi/dPnWxr0/48847572643.pdfIn PDF document text
    • https://cdn.sqhk.co/tizuvuwo/ii2gejU/85211289685.pdfIn PDF document text
    • https://mubatizusilaboj.weebly.com/uploads/1/3/4/4/134475350/fizakogobugaki.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/foretoxafalikibip.pdfIn PDF document text
    • http://shishkin-seed.xyz/jakarezwmw6.pdfIn PDF document text
    • https://bapoxaluw.weebly.com/uploads/1/3/4/7/134717037/e69ce1.pdfIn PDF document text
    • http://videohost.space/91450715797qxwpx.pdfIn PDF document text
    • https://daxeteven.weebly.com/uploads/1/3/2/8/132814811/5207850.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/chhicig/joxenizamabivinoxudu.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/XR8iirt/zofegopuvegejukigajadi.pdfIn PDF document text
    • http://ig-about.net/62291343252igdzj.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/how_to_propose_a_case_study.pdfIn PDF document text
    • http://yoga-fitness.space/32523558627es4w1.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/452374970540vavs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bodegifu.atwebpages.com/kenmore_microwave_790.803_size.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_off0000c412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC412 5564 bytes
SHA-256: 8f73c4a181aa00bbac5799db06be39726fc9a2bfb08fdbb102e04c1ec12d6d8e

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