Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c6a9ad342c4521…

MALICIOUS

PDF

79.5 KB Created: 2021-03-29 14:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 77750855733ebcbff344e01d812acb9b SHA-1: 2fcb383d9dc8d5e69d663e15484715e3c2d75f4c SHA-256: 25c6a9ad342c45216f79ac2909c69e19822d46c2cb5b3502ad5d80c31414af0e
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 hosting services, indicating a link farm or redirection scheme. 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 an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://seumenha.ru/123?utm_term=ardms+vascular+cv+form PDF link annotation
    • https://bigufoxorifef.weebly.com/uploads/1/3/1/8/131871864/5384868.pdfIn PDF document text
    • https://keminozabigorez.weebly.com/uploads/1/3/4/8/134886120/382fedd.pdfIn PDF document text
    • http://muzoc.xyz/webuzekoz7fdt3.pdfIn PDF document text
    • http://mikazuxo.mypressonline.com/kujogugexozubas.pdfIn PDF document text
    • http://ergors.space/what_is_the_best_humidifier_for_a_small_bedroomvdgz5.pdfIn PDF document text
    • https://zigifivabukom.weebly.com/uploads/1/3/4/4/134460242/737d1a4fdd23.pdfIn PDF document text
    • http://rulabepotinujeb.mypressonline.com/4752908601.pdfIn PDF document text
    • http://pepirizibizedel.22web.org/87100566671.pdfIn PDF document text
    • http://devgame.design/10307008951yzscb.pdfIn PDF document text
    • http://egosikenclub.com/saxon_math_grade_1_worksheetsmb2g4.pdfIn PDF document text
    • http://telgrm.site/72873283254fw965.pdfIn PDF document text
    • http://fresh-ita.space/anel_rodriguez_estaturassgdg.pdfIn PDF document text
    • https://pagafamowadaf.weebly.com/uploads/1/3/4/8/134878907/5935299.pdfIn PDF document text
    • http://didanak.22web.org/how_to_do_hess_law_problems.pdfIn PDF document text
    • http://webdefilmizle.com/spotify_premium_application_androiddjgnh.pdfIn PDF document text
    • http://xalebiru.iblogger.org/50023517112.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://sulipirakiran.rf.gd/79296759664.pdfIn PDF document text
    • http://fanolegib.rf.gd/samsung_galaxy_note_10_plus_user_manual.pdfIn PDF document text
    • http://bexexakik.myartsonline.com/bronchial_asthma.pdfIn PDF document text
    • http://xepatodop.onlinewebshop.net/arkham_city_walkthrough.pdfIn PDF document text
    • http://winovewivigo.rf.gd/historia_de_mxico_prehispnico.pdfIn PDF document text
    • http://kafozubasopuji.rf.gd/articles_partitifs_exercices.pdfIn PDF document text
    • http://kawobos.rf.gd/78074332492.pdfIn PDF document text
    • http://tagejozef.rf.gd/aikido_filosofia.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_off0000ed04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED04 4748 bytes
SHA-256: 4ce1b3a7c2ed444a069db05dd2407ea5136cf95699262fac5f88008d7208b3bf
font_01_sfnt_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 10992 bytes
SHA-256: c824e8cae229b624d8c5d1778470bbda856b8eca2a2f9c3cba9f9e57aea36f29
font_02_sfnt_off00012278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12278 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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