Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f42443282e908bb…

MALICIOUS

PDF

81.1 KB Created: 2021-06-02 04:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 39e4c3e1f7a2cd5ce1302eec0009194e SHA-1: 2456485c44da67a5ec3452f23d936ced3ac96d24 SHA-256: 8f42443282e908bbcda3d49f4a01c2226fc69753a1cedc160edf32ae6e977af0
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, 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. The embedded URL `https://midufefew.ru/123?utm_term=faded+song+piano+sheet` is the primary indicator of the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=faded+song+piano+sheet PDF link annotation
    • https://zipemulobob.weebly.com/uploads/1/3/4/5/134528333/xikexoseta.pdfIn PDF document text
    • https://jedexapotup.weebly.com/uploads/1/3/4/4/134472831/nuxidaxaribetut-zideb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392864/normal_600d548b9d1b2.pdfIn PDF document text
    • https://lajejajutabi.weebly.com/uploads/1/3/6/0/136050508/kefabezono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478669/normal_605ef3127dadc.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/479438af-c879-42a6-bc8e-dd8423355be9/jesonowotesodumoxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ed7a6e-5bf3-4a9a-8261-235147fc906b/wonazufutiguvalida.pdfIn PDF document text
    • http://katafuzum.pbworks.com/f/semipugizuzibos.pdfIn PDF document text
    • http://fisukafetif.pbworks.com/w/file/fetch/144424971/the_lean_fast_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a5dcdce-00a9-4237-985c-cd3f4d2feb70/gijevufamabuva.pdfIn PDF document text
    • http://bilabegape.pbworks.com/f/57364362601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05c84b49-74a9-43db-a0df-db4005a42ffb/download_talking_tom_2_mod_apk_for_ios.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/f/kalnirnay_april_2019_marathi_calendar_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a78224-7812-415b-a12a-5b3cfc29559b/pixajutasugimonixifosogab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bf2187a-02fd-413e-b32b-bba4e1ac18a6/screenshot_in_windows_10_software_free_download.pdfIn PDF document text
    • http://tusawijer.pbworks.com/f/interstellar_full_movie_download_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73bb1ba8-4735-45a7-99ef-1a6f2f73dd9b/bavedukixoxusinobaxak.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/f/welopugoveditegexupejolub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cf6073c-f3ab-4da5-9b09-c970d3899120/31_days_of_prayer_for_your_future_husband.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_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 5048 bytes
SHA-256: 2e1866bf3e57a87570299b44e1a1541a70a89ea53b63492696216cd737cdfc24
font_01_sfnt_off0001125a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125A 10828 bytes
SHA-256: ce4e1a8c2ec2ed50c1ed7b9244cef5e5c5bd85b2ea6603b1c62489a51d239eaa