Malicious PDF — malware analysis report

Static analysis result for SHA-256 d338d7cb87c7e1d5…

MALICIOUS

PDF

78.0 KB Created: 2021-02-22 12:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d8dadcc5d4ff44c0e8fc0af8c85953fd SHA-1: d4b2fc59b6b2a3be36e122f4896ced5d8a94cf08 SHA-256: d338d7cb87c7e1d521edcbe39e8007afb4526f5ab330921920e0b3968fc39e8d
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of an external URI. The embedded URL, 'https://jacksth.ru/strik?utm_term=bash+script+command+line+arguments+example', suggests a phishing or malware delivery attempt disguised as a technical document. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://jacksth.ru/strik?utm_term=bash+script+command+line+arguments+example PDF link annotation
    • https://dabusoze.weebly.com/uploads/1/3/4/5/134585091/1822920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_5fd5f0cf68fb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375095/normal_5ff43075dd809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489983/normal_60116f242e04b.pdfIn PDF document text
    • http://pitushok.space/22880232086j1g4g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5fd2cb4d3367d.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://s3.amazonaws.com/likadojivivofu/bullying_effects.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/hard_riddles_in_maths_with_answers.pdfIn PDF document text
    • http://nuvupobo.rf.gd/medatapibobixu.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_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 5488 bytes
SHA-256: f405767761085dc5f48c46da34436dda34f76579492134961b66cb839acbf104
font_01_sfnt_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 14184 bytes
SHA-256: e34fe1a97ab18b26606362cefe13303b7d8145c217ebfda05f6ee41dfa9d1815
font_02_sfnt_off00011d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D86 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3