Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a148ac15ba198a3…

MALICIOUS

PDF

63.8 KB Created: 2021-01-08 21:19:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cf2ca45cba1b6398366aa30dcb6a751 SHA-1: 6e8ad7c4637c6d4f772b2e5cabd326d23c5eed01 SHA-256: 1a148ac15ba198a3fa63170c87c1208a37c9ba7b99e73d2145226f0c7944e93d
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. ClamAV also detected it as a phishing trojan. The document body, though heavily obfuscated, contains references to 'Kewaskum high school wi' and 'wkhtmltopdf', suggesting a potential lure or a tool used in its generation. The presence of an external URI strongly indicates an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://trafficel.ru/123?utm_term=kewaskum+high+school+wi
    • https://sovinupuni.weebly.com/uploads/1/3/4/7/134762808/6a7d754a39f.pdf
    • https://sosijujanakuf.weebly.com/uploads/1/3/5/3/135387992/2af3cbc997.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/zanadutut_wexudafenatogun_jetomefoja.pdf
    • https://cdn-cms.f-static.net/uploads/4417830/normal_5fb7f5e4c9cc5.pdf
    • https://static.s123-cdn-static.com/uploads/4485010/normal_5fefc34cef568.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mudurixo/cell_and_their_organelles_worksheet_answer_key.pdf
    • https://s3.amazonaws.com/nokiva/sakon.pdf
    • https://s3.amazonaws.com/naxozelozude/puxufemevivedekapowi.pdf
    • https://uploads.strikinglycdn.com/files/121062d7-b7b7-4189-9f40-6fc750e19256/rojuwavujewevafagonowot.pdf
    • https://s3.amazonaws.com/mexavofezoxi/flow_meter_measurement_lab_report.pdf
    • https://s3.amazonaws.com/levumoduf/xekavimu.pdf
    • https://s3.amazonaws.com/vigevot/sijamunejijoja.pdf
    • 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_off0000bcb7.bin
3d8308fe104aebbe48902ab33dbdb33515ce16d47ac821234fb3e5944494a5f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB7 5240 bytes
font_01_sfnt_off0000ce82.bin
533098b32da9a40e441e3f5cebd624470889ac0dde882bd999a2209d1278670d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE82 10532 bytes

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