Malicious PDF — malware analysis report

Static analysis result for SHA-256 0844ba4acfc3c583…

MALICIOUS

PDF

72.3 KB Created: 2021-02-20 15:10:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bfc4d7197bae5fe781dc3a80f5ff5dd9 SHA-1: dcf6656809659fbca9d9d4e044badc3ee0bf9e1d SHA-256: 0844ba4acfc3c583a97e3caf6538db813555a9629c8c0dd4152cfc834f4718d1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or lead to link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://jottigo.ru/strik?utm_term=black+and+decker+easy+feed+trimmer+line PDF link annotation
    • https://cdn.sqhk.co/lojibuwe/aM1RDoF/13055559545.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/AgiRifz/splash_lagoon_ohio.pdfIn PDF document text
    • http://fesupopimos.66ghz.com/android_one_xiaomi_note_4x.pdfIn PDF document text
    • https://pojamemurix.weebly.com/uploads/1/3/1/4/131408024/76bb5e7fd73.pdfIn PDF document text
    • https://vavulawukuret.weebly.com/uploads/1/3/4/6/134690424/faf8e8f.pdfIn PDF document text
    • https://cdn.sqhk.co/bilexodofose/hcoovid/56868734821.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/ih7Xhi6/hide_n_seek_among_us_rules.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuwixevuje.rf.gd/zenenunafixut.pdfIn PDF document text
    • http://defafezo.epizy.com/vorirolakelulovirin.pdfIn PDF document text
    • http://tolimimagag.epizy.com/canons_of_taxation_by_adam_smith.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_off0000dec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 5384 bytes
SHA-256: def1fd3a2b0f59968b6429436967db20144329866a0e216072fd5de6fa2a182a
font_01_sfnt_off0000f107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF107 10488 bytes
SHA-256: f27e54411a66b4ef563756dda7c24e0882f0312e14e0e61af4a92cda6659ccfc

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