Malicious PDF — malware analysis report

Static analysis result for SHA-256 a429b446d31bdd40…

MALICIOUS

PDF

77.0 KB Created: 2021-02-06 21:11:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cddbe39d985eefd893f9fec66a07c217 SHA-1: b62a036a7f6c913f4ee01b2ed9ce68da4e3eda54 SHA-256: a429b446d31bdd40c212dd9057fc7e14723196d1f2e6ec3070b6efff59a12be6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to disposable domains and known malicious redirectors, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The embedded links likely serve to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/123?utm_term=magisk+apk+download+old+version In PDF document text
    • http://cartest.pro/daily_deals_coupon_code69hwv.pdfIn PDF document text
    • http://ontrade.top/sloth_goonies_actorrlro6.pdfIn PDF document text
    • http://lerinumemikiw.22web.org/34736722998.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/hqeaRhi/6990058226.pdfIn PDF document text
    • http://tryadasert.online/netiwnx35m.pdfIn PDF document text
    • http://cybety.xyz/logik_lbfanx16_manualrk35k.pdfIn PDF document text
    • http://porn77.design/vinodujpzkl4.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/98143451776qzihu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506131/normal_6014efabd9238.pdfIn PDF document text
    • http://presentinsta.online/tipos_de_contracciones_musculares3z4yp.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/OEKWPgj/62494711698.pdfIn PDF document text
    • https://cdn.sqhk.co/koxuzofu/Yhegfhe/tumblr_users_app.pdfIn PDF document text
    • https://cdn.sqhk.co/lesepivir/4gihveK/vowupiteso.pdfIn PDF document text
    • http://salestore.pro/advanced_spanish_grammarmvyvq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tokit/roloxepu.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/kindle_app_for_ipad_mini.pdfIn PDF document text
    • http://sujetokotew.rf.gd/galvanised_sheets_wexford.pdfIn PDF document text
    • http://pasasowagore.rf.gd/rofama.pdfIn PDF document text
    • http://valamujunitun.epizy.com/nih_template_biosketch.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/stage_alternance_informatique_nantes.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 5348 bytes
SHA-256: a93b915f7ed35c1d51a34cc3062afc64c45cb94a104f545ed6ca8d2b9fcf6ea2
font_01_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 10516 bytes
SHA-256: e9bd380891ba965ea517f6e089dd61e43aaefd523e244f4aa8ded28f61282dce

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