Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a8b1fc2f845eea…

MALICIOUS

PDF

74.1 KB Created: 2021-02-20 18:33:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 441f1805b808ffcb6a0c9123e76a4a11 SHA-1: eab0290c26882bd22b51c75f66971478550f8db1 SHA-256: f5a8b1fc2f845eea2910715605fed79a3244d25b1b025db4edfdde8d2aeadbe9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the presence of many external URIs suggests an attempt to redirect the user to malicious content, likely leveraging embedded JavaScript within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=what+does+typography+mean+in+language+arts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388178/normal_5fe9d3e144173.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450003/normal_5ff8fe27db0c1.pdfIn PDF document text
    • https://sukorason.weebly.com/uploads/1/3/4/5/134578332/6523480.pdfIn PDF document text
    • https://cdn.sqhk.co/nagebagem/aOxY705/76601716141.pdfIn PDF document text
    • http://kigonowepim.iblogger.org/98616450588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_600d267d41dfd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498893/normal_6009386c7b9a5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuginafana.epizy.com/project_coordinator_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/reveal_password_asterisk_android.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/bose_soundlink_iii_manual.pdfIn PDF document text
    • http://notewewagegev.rf.gd/40089356515.pdfIn PDF document text
    • http://zosajirigo.rf.gd/auditing_notes_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/23781527210.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/54798637876.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/33971022063.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_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 5488 bytes
SHA-256: 55d0ae43f2a3ffffdeceaacb83a60f2a1967ea3528cad42ad08f4504bcb3dbc9
font_01_sfnt_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 10180 bytes
SHA-256: eb3932068a46b8f7128dce61f2df5494ae6c9fff12c9dafe9e2bc1f1946dc0df

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