Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2ab6252787956d…

MALICIOUS

PDF

75.1 KB Created: 2021-03-01 15:39:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 173d08d2f4453fb03b86cfc5b0b72302 SHA-1: c2f2242025fd9b919773f586de9c71ee63f31348 SHA-256: 5a2ab6252787956d0604cab313faafb17917efaa4e7d58be386203afe91b1e7d
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or malicious redirection scheme, likely delivered as a spearphishing attachment.

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 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://druttle.ru/123?utm_term=mouse+guard+comic+review PDF link annotation
    • https://cdn.sqhk.co/xuzalolotagi/Zhcicgf/fall_guys_ps4_change_controls.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454048/normal_601b2f1463278.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/nebugafanabebe.pdfIn PDF document text
    • https://jetisinodab.weebly.com/uploads/1/3/5/3/135335938/vavipusal.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/GjculDr/crime_car_driving_simulator_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tigufarejeti/RU7kfnQ/57877625491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_601c6a6aa33a0.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/what_is_a_flavor_wave_turbo.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/8046564220.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/pisik/nubezib.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/bts_short_funny_video.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/76714705738.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/upper_extremity_study_guide.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/aircraft_maintenance_technician_jobs_canada.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_off0000e92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 5384 bytes
SHA-256: b39eab7067dabc72a5fe5a161c4aae243c0f0344ebd4651b97a8afbb2ccdd380
font_01_sfnt_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 10704 bytes
SHA-256: b5eb21f552db6d03691f269e016428547324add23ec82ead37ce982704e9a6e5

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