Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a911b5b5aa079a…

MALICIOUS

PDF

70.9 KB Created: 2021-02-27 07:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 157fec32060a88552ee7d77ea73ff5f2 SHA-1: e8b85cc61fa4c05eaf418b058458e970d3c37514 SHA-256: a9a911b5b5aa079a36e22e94940470ae804264b5633e320629097f0f440b2069
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though heavily obfuscated, appears to be related to the embedded URL's query parameter, suggesting a lure to trick users into clicking the link. No scripts were extracted, but the presence of an external URI and the detection signatures indicate a phishing or malware distribution 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://soxebez.ru/strik?utm_term=why+won%2527t+my+ge+fridge+make+ice PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5ff422566a1b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471514/normal_5fc894764c3de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445119/normal_5fe05f963a228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409248/normal_5fd3426f50a81.pdfIn PDF document text
    • http://vizit.store/antoinette_espn_reporterdkd09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422390/normal_5ffb4169d9ac1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407729/normal_60264546949e5.pdfIn PDF document text
    • http://bunnygummy.ru/66453777116scqay.pdfIn PDF document text
    • http://logekolumo.22web.org/nonprofit_business_continuity_plan_template.pdfIn PDF document text
    • http://antinomi.design/21576016421w7gwe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vosolapigufax.epizy.com/dolls_house_summary_in_hindi.pdfIn PDF document text
    • http://vidujujesux.rf.gd/35773805411.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_off0000d8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F1 5532 bytes
SHA-256: f12a6d58ed33a6f0f001808f22e099b5b4824ae6c8a7f782feb1fb333326393d
font_01_sfnt_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 10288 bytes
SHA-256: 3015da03d719f64039c1ff41431033d92733ad87582c618f4a0461678e519d4a