Malicious PDF — malware analysis report

Static analysis result for SHA-256 721281109fe46add…

MALICIOUS

PDF

69.4 KB Created: 2021-01-14 11:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 83d05689be90e91b25c7af94994d9217 SHA-1: d314bbe99faa6fd5cabe6625be50d36ba8f70ce5 SHA-256: 721281109fe46add3486384bf7089a57b632a4139caeb49efaf03e47ad452008
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful external sites, likely for credential harvesting or further malware delivery.

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://trafftec.ru/aws?utm_term=edgenuity+answers+geometry+isosceles+triangle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5fb2530615c92.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/tidazaxawir.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/cITjh6u/highway_patrol_scanner_app.pdfIn PDF document text
    • https://site-1176767.mozfiles.com/files/1176767/movie_creating_software_for_pc.pdfIn PDF document text
    • https://site-1201629.mozfiles.com/files/1201629/nejotu.pdfIn PDF document text
    • https://cdn.sqhk.co/xidodaxu/egjsiiz/ludo_star_2_hack_unlimited_gems_coins_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/yhfghgi/15099547367.pdfIn PDF document text
    • https://cdn.sqhk.co/matelasoguje/gcttZii/sotunozolotomexek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497348/normal_5fd7c239c88ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454971/normal_5fab813865e60.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/e5Qhhie/34009456869.pdfIn PDF document text
    • https://cdn.sqhk.co/dojatejij/jiihias/notepad_alternative_mac_os_x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474445/normal_5ff9ca2c27938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387421/normal_5f904591f17e2.pdfIn PDF document text
    • https://cdn.sqhk.co/jemajujo/iigie5O/decoracion_de_halloween_para_salones.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/jaloto/aashto_soil_classification_system.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/52040506823.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_off0000cfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEF 5412 bytes
SHA-256: f3dc4c584abfb701e491a8cc82e3afc196b4593e696ce057fe62a089aecb7b13
font_01_sfnt_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 11112 bytes
SHA-256: 115c19875121d0e7c2505ae65913f22b87b66614d6d7f33c682dcc4fdb5b70d6

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