Malicious PDF — malware analysis report

Static analysis result for SHA-256 e020fd9a54b48a64…

MALICIOUS

PDF

68.1 KB Created: 2021-03-02 21:07:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4bb3ae30c12b793c2aacb97b5568d056 SHA-1: d99fbef004e96e803ff1f7e700b4aa8c50f165db SHA-256: e020fd9a54b48a64b794e98f70d992bb08aaf8cf4e0f8587db690ce420f512b5
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and services like sqhk.co and weebly.com, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM confirm the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 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
  • 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://kuzutuzo.ru/award?keyword=mary+poppins+quotes+spit+spot PDF link annotation
    • https://cdn.sqhk.co/besogevipadi/idiciiK/50791245250.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/gjcThjS/meluwewapamuluku.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/865cac7c871f079.pdfIn PDF document text
    • http://vovpomnim.ru/90138756138vgz1p.pdfIn PDF document text
    • https://cdn.sqhk.co/susotizakaxe/isgdqq0/57704227677.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/Cghhaja/21465206299.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/02MEicg/nomuvewejigobuxifikuwirel.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/batala.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/hdEkD24/the_walking_dead_movie_1995_watch_online.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/d747f7b2a.pdfIn PDF document text
    • https://cdn.sqhk.co/xonarewu/exThdic/olympic_archery_equipment_price.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/jShbhbw/facebook_search_history_delete_automatically.pdfIn PDF document text
    • https://bowalizixoled.weebly.com/uploads/1/3/1/8/131872289/a2552bb64b9.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/fMCiiJJ/kesoru.pdfIn PDF document text
    • http://nonly.xyz/148509511466usei.pdfIn PDF document text
    • https://cdn.sqhk.co/moxoxitij/Nqjedjh/desert_riders_1._2._1_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/9jilhe2/bidudatajofenaregavexez.pdfIn PDF document text
    • https://pejejejepo.weebly.com/uploads/1/3/2/6/132682076/nazade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/scientific_workplace_free_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/fire_emblem_awakening_reclassing_guide.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 5016 bytes
SHA-256: 26e3afcb9ac8c03d86b29f39b1316e8b0c4bad9ef1446efeda8176e1b7a874ee

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