Malicious PDF — malware analysis report

Static analysis result for SHA-256 587366434dc5683d…

MALICIOUS

PDF

72.0 KB Created: 2021-03-23 14:21:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 22ed604af158b6c2425d326472361ea4 SHA-1: c27ae047f13f8192af21bb35dd5fa69f676262bb SHA-256: 587366434dc5683df4e159aada60926e98f5f1003cdc295b6b7fe7e752c5f2c4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://jacksth.ru/wix?keyword=algebra+tiles+worksheet+6th+grade PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449012/normal_5fe6ec9534b30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391907/normal_6049833f9616d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475992/normal_6048d92b26f1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382961/normal_6050395b73af7.pdfIn PDF document text
    • https://fusavufotopos.weebly.com/uploads/1/3/4/6/134634064/0267a9a10a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_604f2841427d3.pdfIn PDF document text
    • https://puvudidaf.weebly.com/uploads/1/3/4/2/134266954/padosejulu-dawowiwu-bizogegojaka-joluzefus.pdfIn PDF document text
    • http://bobixuposu.22web.org/bootstrap_login_form_design_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447460/normal_5fee99a8cd78f.pdfIn PDF document text
    • http://logefekur.22web.org/neoclassical_growth_theory_vs._endogenous_growth_theory.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_5fdbb6e6aebf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384030/normal_5fec9fed44106.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417029/normal_5fc9340684643.pdfIn PDF document text
    • https://dobuxodujunov.weebly.com/uploads/1/3/2/7/132741154/6782ae0.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/sedimeraxufi/30939671461.pdfIn PDF document text
    • http://luwegovufa.epizy.com/92797857401.pdfIn PDF document text
    • http://nuzelego.rf.gd/castrol_magnatec_stop_start_5w_30_a5.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/46462069124.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/funciones_del_gerente_de_alimentos_y_bebidas_en_un_hotel.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/tlcharger_image_iso_windows_7_64_bits_gratuitement_en_franais.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/38910757564.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_off0000db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB56 5524 bytes
SHA-256: 865ace44a08670b96d179eaf91f4b856f4ecea541cf406d94ad71e247eaa1b52
font_01_sfnt_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 10796 bytes
SHA-256: 276d7fa4e30b14a14fb1cda28ceb8a5f1bd43a59cbf074ace84f5437c8544187

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