Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a864f1e5c7f9ac…

MALICIOUS

PDF

72.9 KB Created: 2021-04-08 05:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3db1fcd16ee640b89849a93bfd346d87 SHA-1: db1f6d3e24d25b63fcf1f8a4aba2844991e55bee SHA-256: 68a864f1e5c7f9ac23a56f64685e2646c857a141a4559223af327884715464dd
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://seumenha.ru/wix?keyword=y+guides+patches PDF link annotation
    • http://sudesisobibimit.22web.org/teamviewer_8_full_mi_nht.pdfIn PDF document text
    • https://cdn.sqhk.co/wesuwajil/glgi4AB/mobile_facilities_application.pdfIn PDF document text
    • https://tugadebijo.weebly.com/uploads/1/3/4/0/134042488/8f241bb3e958b.pdfIn PDF document text
    • http://jofarofuwudeveb.66ghz.com/flutter_app_template_generator.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/apcgdjj/ramurolonadiponumap.pdfIn PDF document text
    • https://nafuxiba.weebly.com/uploads/1/3/4/0/134097784/zesum-madofiriguronep-wegajeritugina.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/fXqNggn/69323904454.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/7050640.pdfIn PDF document text
    • https://cdn.sqhk.co/terodekijur/hbhcLgd/84600239145.pdfIn PDF document text
    • http://wudenufodoroziv.scienceontheweb.net/list_of_important_days_in.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/Ryhfhio/tinkler_funeral_chapel_crematory_fresno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nafinuxunowu.rf.gd/assetto_corsa_2_pc.pdfIn PDF document text
    • http://suwotewi.epizy.com/32063983538.pdfIn PDF document text
    • http://litorow.myartsonline.com/5552497982.pdfIn PDF document text
    • http://nudowuva.rf.gd/4962029665.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/14th_finance_commission_report_on_local_bodies.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/31045440172.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 5168 bytes
SHA-256: 77a8b2a345f2e1e3701804d2a98e435b054264341a41cdb46581979242f18d57
font_01_sfnt_off0000ef30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF30 11148 bytes
SHA-256: 2f2481d191511466661f07312e72cc5126769673e12f73f13ce7516c518c19d7

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