Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7c1a59ce7a0772b…

MALICIOUS

PDF

78.2 KB Created: 2021-03-25 13:00:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25f1e4c9efa5d2d71def132984f7dc4c SHA-1: d74fa5fba62f593816ddb9d9846f238b13f87839 SHA-256: a7c1a59ce7a0772b0a320f41094a03df0211b744ea865eb86701d8fedc9f2699
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing attempt. The embedded URL and the document's apparent purpose of luring users with a fake download link are strong indicators of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/award?keyword=biology+book+class+10+pdf+free+download
    • https://vojutodebol.weebly.com/uploads/1/3/4/0/134096580/7833230.pdf
    • https://cdn.sqhk.co/retirijozi/tujcia1/64996216204.pdf
    • https://bebamewikirebu.weebly.com/uploads/1/3/0/8/130874540/vaxejo.pdf
    • https://xokebewogaxuwu.weebly.com/uploads/1/3/4/5/134588239/xibon_gawutaw.pdf
    • https://mojilizide.weebly.com/uploads/1/3/1/8/131857690/2bfeea61bba337c.pdf
    • https://cdn.sqhk.co/jivazufevi/gcpjdhf/tewokixegepitukedugag.pdf
    • https://lilexoben.weebly.com/uploads/1/3/5/3/135331811/komeraveneru_repaf_gexoxanof.pdf
    • https://cdn.sqhk.co/zodozane/iecJje4/crossfire_3d_3rd_person_shooter_critical_warnings.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/safenalavojuwu/financial_statement_template_canada.pdf
    • https://s3.amazonaws.com/dowadotiju/64758223025.pdf
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_b393b99a487c4608838d5b80955975fb.pdf?index=true
    • https://s3.amazonaws.com/wizidimawag/zodonopusavowoweneso.pdf
    • https://s3.amazonaws.com/polexebuj/evaluating_linear_functions_worksheet.pdf
    • https://s3.amazonaws.com/lizuseguwix/56790909190.pdf
    • https://s3.amazonaws.com/sixolose/83032941142.pdf
    • https://s3.amazonaws.com/wurivuve/38458482830.pdf
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_4c5c916a332440fdaacab9b55ee6d112.pdf?index=true
    • https://s3.amazonaws.com/fodose/employee_formal_complaint_form_template.pdf
    • https://56a79910-2d97-40e4-a1df-bca3b17021d7.filesusr.com/ugd/2721fc_0388bccb6fa74befaf180da12e4dd828.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee97.bin
bdeb0e03d7979dd7db017eb1809ac6a4c517b86f3deac7aa3d3acf5cc16dad37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 5964 bytes
font_01_sfnt_off00010319.bin
9da0a97ec76bf959919295c2d85b35249aaf9ce7c32668f1d7dd6a25326f8a3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 11912 bytes

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