Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5ae4a80be569351…

MALICIOUS

PDF

66.6 KB Created: 2021-02-26 08:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b4a9d49fab1f0c03110fa68c8df5b90e SHA-1: b3ddfaa7475408ddc833d0d6355b4af24d0769bb SHA-256: c5ae4a80be5693514785217d0286b666c39a31e6146041d30fea45d3bf8278cd
182 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which are hosted on disposable domains or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary attack pattern involves luring users to potentially malicious websites through these embedded links, likely for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 4

  • 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 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=browning+a5+hunter+semi-auto+shotgun+-+12+gauge In PDF document text
    • https://mixizuvas.weebly.com/uploads/1/3/5/3/135383824/marujizozuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426425/normal_602e554259fe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446015/normal_5fd380f988367.pdfIn PDF document text
    • https://sadozilodefizon.weebly.com/uploads/1/3/4/6/134659806/tiwijujatiterukusamo.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/what_does_passport_application_is_under_review_at_regional_passport_office_means.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/how_to_connect_backbeat_fit_to_computer.pdfIn PDF document text
    • https://zudibuliri.weebly.com/uploads/1/3/5/3/135319562/9480625.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_601ba687124dc.pdfIn PDF document text
    • https://dafubadam.weebly.com/uploads/1/3/0/8/130874240/5308090.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/hiNifgh/mini_challenge_race_results.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416929/normal_5fc740ff2d72c.pdfIn PDF document text
    • https://cdn.sqhk.co/wirubetena/6Xhiiic/87420456841.pdfIn PDF document text
    • https://cdn.sqhk.co/xogedusov/jjcdiew/85546972447.pdfIn PDF document text
    • https://zaxezoxixuj.weebly.com/uploads/1/3/6/0/136097133/sadasirexonijimarul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/pixhawk_blheli_esc_calibration.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/33906030367.pdfIn PDF document text
    • http://livirava.atwebpages.com/70805879995.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/du_b._tech_online_form.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/putuki.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/rosuri.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_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 5432 bytes
SHA-256: dd38d00508b361dd1b61a9a5f893ec502fcf17230613bddebe84dd7425c0efae

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