Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17bf6a6b76aeba8…

MALICIOUS

PDF

76.8 KB Created: 2020-12-06 00:20:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 156002ce80f500383076fc5f6badd6ea SHA-1: 159d4add200117e9d6f220f6f8f324f48b0d96db SHA-256: f17bf6a6b76aeba8c147d4b10bf0ed6249326aeb363e1f989ec321ff3f7dab4d
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to accounting terms in English.

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=terminos+contables+basicos+en+ingles PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469863/normal_5fcc04302608a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_5fb39bb4b92c8.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/votubukaxogilix/2628365892.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1116c11f6a41984869c2f/t/5fc30281145a8629dc14242d/1606615682155/iron_man_2_poster_4k.pdfIn PDF document text
    • https://s3.amazonaws.com/pazaxazusa/apush_period_5_dbq_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/sgk_e_bildirge_ifre_formu_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484b9180-af67-4099-95d3-a7923b649c7f/billionaire_casino_free_tickets.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/rerewegawozebunaxemoma.pdfIn PDF document text
    • https://s3.amazonaws.com/silubebebefuju/yahoo_answers_app_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/84881007672.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/98827135823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4135b8a1-6640-4a78-92b7-67297c952fe9/90335930861.pdfIn PDF document text
    • https://s3.amazonaws.com/gonavo/narurepimakexebeme.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_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 5208 bytes
SHA-256: 9dd6d20255dfda70fcd06182724f89039fcfa7bc5f65755f5e31638abb6ec02d
font_01_sfnt_off0001005d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005D 11108 bytes
SHA-256: 3f2c214704c905c9aa8dac5be95aab26e10d1544101933d88c9f5055516ff6a3