Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dee3673ae04d206…

MALICIOUS

PDF

72.1 KB Created: 2021-03-24 04:39:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3600beb2497c8f56aac9d15e2691287d SHA-1: 43c17d247fc50ba52ba74f993ce39a718694c9db SHA-256: 5dee3673ae04d20642f225d172f1156430bdb2f681fcf69d3b73b7c330d31337
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

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
  • 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
  • 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://jumiwimov.ru/123?utm_term=chaniya+choli+photos PDF link annotation
    • http://nomokesus.sportsontheweb.net/download_visual_basic_for_applications_7.1.pdfIn PDF document text
    • http://tonevagewalilu.medianewsonline.com/89376613705.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505687/normal_604d0bfd8a42b.pdfIn PDF document text
    • http://nidewopovuwubo.mypressonline.com/bulezavagafizirexino.pdfIn PDF document text
    • https://sunowakodi.weebly.com/uploads/1/3/2/8/132814938/kugonena.pdfIn PDF document text
    • http://devivitonewe.sportsontheweb.net/25276500640.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/xorefejewu.pdfIn PDF document text
    • https://tajamopem.weebly.com/uploads/1/3/4/7/134745730/kapepidupipilotor.pdfIn PDF document text
    • http://xexapitanegis.getenjoyment.net/fourier_cosine_transform_heat_equation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477137/normal_5ff527ec5ddfa.pdfIn PDF document text
    • http://pipavinekiga.mywebcommunity.org/two_wheeler_authorised_letter.pdfIn PDF document text
    • http://tadolonelo.sportsontheweb.net/nicomachean_ethics_crisp.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/41057691776.pdfIn PDF document text
    • http://kobivoweder.mypressonline.com/juzubenulumoximufisetu.pdfIn PDF document text
    • http://paselon.getenjoyment.net/sisap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laxuzoto.onlinewebshop.net/29735670696.pdfIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_ee5290345d8742f59bc1ac37a2ee6f78.pdf?index=trueIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_70c37a4768a9424abb3ad339e845c868.pdf?index=trueIn 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_off0000df12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF12 4932 bytes
SHA-256: f5dfb20032cc59477b9b9d1713519db6f1f8ec29315b677b106c6dccb95c8767
font_01_sfnt_off0000efde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 10456 bytes
SHA-256: e94a51bb3a71e31b12dd8e0e86be85b9ab79cc02687d0178075708ab07183e1c

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