Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fc01627652b25d…

MALICIOUS

PDF

79.0 KB Created: 2021-03-23 18:03:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3f7e599bf02a7300487362190dfc7be8 SHA-1: ec9371a5be079c4e622d8604d38893685fcd4592 SHA-256: 25fc01627652b25df19d82c17b8688036573e1ba3cde123f8b4315e21f4b5791
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it uses a social engineering lure to prompt the user to install a browser extension or update, a common method for malware delivery. The document also contains multiple external URIs, including one pointing to 'gimoguvi.ru', suggesting it may attempt to download or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gimoguvi.ru/123?utm_term=vidmate+apps+install++apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495837/normal_5fd0ffa2db66d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491936/normal_6004cf4075280.pdfIn PDF document text
    • http://idealicaitalia.website/lonely_planet_cuba7ennn.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/76194159902pqs0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390330/normal_604fa87a2bd72.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/dezezitararog.pdfIn PDF document text
    • http://kapusta.pro/jezisibaradckya.pdfIn PDF document text
    • http://lejazubi.iblogger.org/cuando_ocurre_el_ciclo_de_krebs.pdfIn PDF document text
    • http://copyright-infringement.business/7346553959008x3e.pdfIn PDF document text
    • http://minuette.me/juwovixatadopetijogos9lj4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426819/normal_6037f13c94f98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_602abe00ab6e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381759/normal_5fdfd83a34193.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dibesenowox.epizy.com/binge_eating_disorder_symptoms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/725f6c2b-cfdd-4af3-8954-31056f906334/92290731245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c5b67bb-386c-4e54-b8d6-e9037cbf83d1/86884751215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73232691-bf40-4cfe-878c-f65951a65bad/56567579795.pdfIn PDF document text
    • http://polabufu.myartsonline.com/antrenmanlarla_matematik_1_cevaplar_zmleri.pdfIn PDF document text
    • http://mukanebesiva.atwebpages.com/13001192774.pdfIn PDF document text
    • http://ligujizulogi.atwebpages.com/satixuwukaduxedu.pdfIn PDF document text
    • http://nilifujajug.epizy.com/the_presidents_book_of_secrets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 4716 bytes
SHA-256: d56539127774eb6043a869fa3dd680a4d51ac9d80afaefd57f610dbc5d7a52a1
font_01_sfnt_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 11164 bytes
SHA-256: 3927eb4b8ebeb67780e2474836d0143a5a0ba644e69408f3c2cb4cecffd5afb3
font_02_sfnt_off000120a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A8 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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