Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1938263611d6724…

MALICIOUS

PDF

72.9 KB Created: 2021-02-02 22:03:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3e7f0954bafccb0d8a573753babc3e65 SHA-1: 878ea3ba9c63460e2e1479db58dd212fbf44ce6d SHA-256: b1938263611d67241d051e589b9edbd74ea253d94cfe04e6999ddd3b5e495ae8
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an external URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the detection suggest it's designed to exploit users through social engineering, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=how+to+survive+and+maybe+even+love+nursing+school PDF link annotation
    • https://cdn.sqhk.co/sidogorego/cugUjif/xavituluvidib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445573/normal_5fee5555f182c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410965/normal_6005946a4f0c7.pdfIn PDF document text
    • https://cdn.sqhk.co/kenujowemi/ihhajbH/likijokekovavur.pdfIn PDF document text
    • http://bcipreactivaperu.com/8894536683t3e9m.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/giQifIK/vopatuxe.pdfIn PDF document text
    • http://populiro.iblogger.org/nice_guidelines_hospital_acquired_pneumonia.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/heBia0P/39740851428.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475375/normal_5fefb044874b9.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/jfjbngf/sozotegizorivavumugufora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_6018d7ba93fea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zujugefov.rf.gd/womutegufowaxosiworivifu.pdfIn PDF document text
    • http://xuvafinuvewabek.epizy.com/70218509144.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_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 5708 bytes
SHA-256: cd32035147bd97f0aad6cb2276650eb0f2b54bd078952f3f40b9424824b722a3
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 10400 bytes
SHA-256: 50226888d0b40e34dff07d4bbbf3c8a2b37979e8c8c0116505c27799da64349d