Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6823d48e530b4a…

MALICIOUS

PDF

70.9 KB Created: 2020-12-17 09:46:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 12cc6571829ab2be4a8923b86fc7a3bc SHA-1: 71a3dc5cf0456b6f940d8e3dc3cc7f4c8ce83e74 SHA-256: 3a6823d48e530b4a1ecb30e012225035408da94150e5e16bfb2d39718792dc96
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded URI suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=do+arthropods+bilateral+symmetry PDF link annotation
    • https://xekawipafamut.weebly.com/uploads/1/3/4/3/134328312/7948480.pdfIn PDF document text
    • https://nujelojebalu.weebly.com/uploads/1/3/4/6/134690198/4248682.pdfIn PDF document text
    • https://dedutosaku.weebly.com/uploads/1/3/4/8/134852257/c2604a.pdfIn PDF document text
    • https://basafokadu.weebly.com/uploads/1/3/4/7/134706648/darosufosipidazowibi.pdfIn PDF document text
    • https://jufozovujibozom.weebly.com/uploads/1/3/4/3/134360308/xuwiduvekepo-lirorawiseros-zutemil-figakasesuzuvaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/cf4e2de5-c8b9-443e-a319-45de4400cc07/when_we_were_young_trumpet_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57eaa45e-0bc0-468a-8d2b-0dd497229aa8/clicker_heroes_hack_codes_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/585c603e-f547-4d63-ad42-fd5f5935192a/vault-tec_stash_box_003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82db82c5-f4f2-488f-8c05-84cb34c97557/66733366793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a117d639-33d7-464b-848e-df273da93e78/wojotuligudexeneraxaf.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/arithmetic_reasoning_shortcuts_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d74115d8-8e78-4213-a1bb-e56499e947c1/nidumor.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA81 5120 bytes
SHA-256: 4fa87ba364200533398c52abdb91c7e9a3454f81722fd08a5128371c1d4edb7f
font_01_sfnt_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 10268 bytes
SHA-256: 9a99199d779ae42e37a407410e55fa7a14997377ba0c23d5b05d8d041d1571b2
font_02_sfnt_off0000fee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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