Malicious PDF — malware analysis report

Static analysis result for SHA-256 c210c4b7a9281841…

MALICIOUS

PDF

68.1 KB Created: 2021-01-22 01:28:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ac6cb07e1775a347ed9213902ed4562c SHA-1: df869cc3cb9d318660bfc29a01f486e56df71166 SHA-256: c210c4b7a9281841ce78b8240bfd7c5b9b54e1122c34d28defbd23b547ec60c6
126 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and heuristics indicate it functions as a link farm, directing users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body, though obfuscated, contains text related to 'Garfield school district number', which is likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffe.ru/123?utm_term=garfield+school+district+number PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465270/normal_5fd13ce00f051.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489844/normal_5ff8a9eb98d6f.pdfIn PDF document text
    • http://zuvinesewuwiz.iblogger.org/adolf_hitler_biography.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424400/normal_5fdbf55d77669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_5fdb9d885af80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450003/normal_5ffb3430bbfcc.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/ejcTig8/jepuxotidizisusogug.pdfIn PDF document text
    • https://cdn.sqhk.co/towafeniruje/wgfIo0p/fuel_rewards_promo.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/Lbgdhgo/88413769991.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jozivunawitud.rf.gd/jufenakivovetelak.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/digamunefitabenibiso.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/commonwealth_edison_power_outage_report.pdfIn PDF document text
    • http://doruxexim.epizy.com/wedding_ceremony_order_template.pdfIn PDF document text
    • http://pibanifadedo.epizy.com/dasiw.pdfIn PDF document text
    • http://bugudejekizukem.epizy.com/sawilakovud.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/17724252180.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/aqa_gcse_biology_lab_book_answers.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_off0000ca68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA68 5432 bytes
SHA-256: b0afb331f7947584fc1ba9a703a2a5e0ef3b741e67a4d35ae86984137c72fde6
font_01_sfnt_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 10968 bytes
SHA-256: 965e2d02eff3c83780c2bd1f1dd650c191a71881f601c9954ba794faf971ddfa

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