Malicious PDF — malware analysis report

Static analysis result for SHA-256 28096ed66875ec9c…

MALICIOUS

PDF

77.4 KB Created: 2021-03-02 06:56:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: ae70e14eba5eb0fe93b707580d8d6a53 SHA-1: 44584be722f61fca708391e610fe07d0e41503f2 SHA-256: 28096ed66875ec9ca5cf2db92c2d206f30e61c9ddc3ae5688ef7267930c7ff2d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and configured as a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely serving as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=how+do+i+know+what+model+ezgo+i+have PDF link annotation
    • http://kojazunupetip.mygamesonline.org/java_functional_programming_tutorial.pdfIn PDF document text
    • https://vadurevagide.weebly.com/uploads/1/3/3/9/133999829/d8bdf0.pdfIn PDF document text
    • http://wiinorama.website/canoscan_8800f_manual9bu5a.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/boxaji_belagota_volajol.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/bijwt7j/shudder_2_month_free_trial.pdfIn PDF document text
    • https://cdn.sqhk.co/vojeruzujuzi/bj26ibg/25403887343.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/xUhfhSM/7057703974.pdfIn PDF document text
    • https://cdn.sqhk.co/xolokenuw/BhBnhi0/xelowebasepe.pdfIn PDF document text
    • https://xanosetad.weebly.com/uploads/1/3/1/1/131163691/6923071.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/jgUIhcG/southern_african_history_download.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/7N5Pih7/electronic_components_store_near_me.pdfIn PDF document text
    • http://gavediteriremuv.medianewsonline.com/function_notation_practice_worksheet_answers.pdfIn PDF document text
    • https://wegenagozej.weebly.com/uploads/1/3/5/3/135394478/nafejijof.pdfIn PDF document text
    • https://cdn.sqhk.co/molodomo/eDhcVKI/detaruviz.pdfIn PDF document text
    • http://reduslim-italia.website/nobatupeributuwaropm7bbd.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/zakunafu/lowrance_elite_7_hdi_review.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/new_heart_health_guidelines_2017.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_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 5192 bytes
SHA-256: cf085b4d968d10e81a82604007dfe7193ecfd1954201a70df42395c7e1887dfe
font_01_sfnt_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 10732 bytes
SHA-256: e58dba0e7b87a7051f8a35df78e0a81fb2edd065ab568c31509190ae3de8603a

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