Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf094fc5ffc71b9…

MALICIOUS

PDF

90.8 KB Created: 2021-02-16 02:22:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8952ba69d11036a7a0bd026cd65a6ba5 SHA-1: 01bb5f438e6a2f0a6b16372d14f3af0b7903e817 SHA-256: 8bf094fc5ffc71b91638175baad53445c57013844499f4bc1f6d3af75f504ccd
126 Risk Score

Malware Insights

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

The PDF file contains multiple URLs, with one prominent URL suggesting a firmware upgrade lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of numerous external links and the document's deceptive content point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://druttle.ru/strik?utm_term=dd-wrt+router+firmware+upgrade PDF link annotation
    • http://bbflowers.net/19061162753hsz3o.pdfIn PDF document text
    • http://duplicwcnj.space/word_crush_level_5513e1ig.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/jjjbNHN/action_driving_school_noosa.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/jhPyHTR/pencil_and_paper_drawing_app.pdfIn PDF document text
    • http://wovolutoxali.iblogger.org/nuvolumunusonabofum.pdfIn PDF document text
    • http://sq11mini.com/vilodunikovoxisajobvyntd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rajiwewovipu.epizy.com/instalar_android_x86_dual_boot_linux.pdfIn PDF document text
    • http://babevuzax.epizy.com/jacoco_report_path.pdfIn PDF document text
    • http://tetexamafikej.epizy.com/white_chunky_block_platform_heels.pdfIn PDF document text
    • http://vafotapezetu.rf.gd/kivavabunotubufol.pdfIn PDF document text
    • http://xepalufozakot.epizy.com/22776944908.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_off0001253f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253F 5272 bytes
SHA-256: bdd62bf2ab2d15bb952ae9454d59ac41f7058096ba4ec93e4e790a561c4fe0d0
font_01_sfnt_off0001373b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373B 11656 bytes
SHA-256: c831b3390ea1b272b759cd76c0d80ab7dfc3f201d35c8e19aa2785a2970c7337

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