Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c88fcada1116b7…

MALICIOUS

PDF

74.2 KB Created: 2021-03-17 15:42:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2680dc40c8bcd5b25fd3facb84f90f91 SHA-1: 172fb730ee95de390b255a1711ec1b8640b7b753 SHA-256: d5c88fcada1116b70feadeb46b509d4785c480ef25b23c6a4d3c5f42f8ad0019
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, flagged as a link farm and indicative of phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=mxq+box+user+manual PDF link annotation
    • http://blacklaser.ru/deadpool_game_for_androidpfkxj.pdfIn PDF document text
    • http://bbflowers.net/allen_bradley_powerflex_40ptzaqd.pdfIn PDF document text
    • http://zikifogomi.22web.org/lurilewogezegasimotex.pdfIn PDF document text
    • http://startbastar.online/75342522728udctb.pdfIn PDF document text
    • http://idealica-official-it.website/60864173128n2ddc.pdfIn PDF document text
    • http://vunixifatirami.22web.org/63598180043.pdfIn PDF document text
    • http://natikolom.site/68327593957n40ct.pdfIn PDF document text
    • https://rijagadufe.weebly.com/uploads/1/3/1/6/131606992/daxupim.pdfIn PDF document text
    • http://firstdoctor.xyz/825112305643vbsu.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafuzivega/rDWggje/uphill_racing_shoot_to_climb.pdfIn PDF document text
    • http://tohld.in/4212440305087ryy.pdfIn PDF document text
    • http://zoom-omsk.ru/motori_a_combustione_interna_migliacciovqyk4.pdfIn PDF document text
    • https://sutulozutujak.weebly.com/uploads/1/3/4/8/134884412/30f8bb46a4.pdfIn PDF document text
    • https://tunuwadubozowe.weebly.com/uploads/1/3/4/3/134363043/pabowojiwofuvobage.pdfIn PDF document text
    • https://cdn.sqhk.co/wovupeni/cDjthY9/umc_hospital_las_vegas_covid_testing.pdfIn PDF document text
    • https://mewofotas.weebly.com/uploads/1/3/4/5/134524455/vutaxezerewene_keresoditawotu_nuxubefi_fodonuliron.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff7a21c-214f-404b-b302-c9fd6d4e2f6f/mcgraw_hill_education_6_sat_practice_tests_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/649dcb9b-5312-4316-908e-4467c20f21e6/40528852411.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1db3ca3c-c6be-4b41-9ba3-34e261136b2f/jeloveduwupafile.pdfIn PDF document text
    • http://bidetorula.rf.gd/free_niv_bible_for_android_phone.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_off0000e4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 5172 bytes
SHA-256: 5e1bd4ad6369877c078ee12a27e4ce70511b32709f0543b462b11030bc47a3b1
font_01_sfnt_off0000f67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67B 10968 bytes
SHA-256: a1f0160438e7645f496c75176a9521165f7c9fc7ed7154b79e94504174baaed3

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