Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8aafe74b3a9b50d…

MALICIOUS

PDF

83.8 KB Created: 2021-03-27 18:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3659d6cf9d453e4f3dfdea3a5fe6a742 SHA-1: 5f722e978c1617f75989a47835ab2a946a87427e SHA-256: b8aafe74b3a9b50d14d6aa8ce34395d7488e8657e202c0123a9faabc35d8c4ef
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL pointing to a domain that appears to be part of a phishing lure, disguised as a divorce affidavit document. The presence of PDF-specific heuristics further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=divorce+affidavit+format+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387715/normal_5feb34c50622f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502188/normal_5fd65deda14bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379605/normal_600f042ed118e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374699/normal_5feef162d16a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_60341d2f2969f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_603c1b86af3f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_603178556a277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408713/normal_6024656960a19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376609/normal_6003518a779ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476302/normal_5fcbe284e0775.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fufabufitilaf.epizy.com/fawivobas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e35014ad-4415-447d-8eff-74ae298f2390/how_do_i_get_a_homeschool_curriculum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d778a0a-fc7f-4bb8-bd24-d5519f9ad47f/78882946457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bcc76e9-87a0-434c-a2af-49f685b34f70/libro_biografia_de_grandes_cristianos.pdfIn PDF document text
    • http://vokaraw.epizy.com/nugejizebugixinivoxa.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_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 5152 bytes
SHA-256: f80a595a5b2626908f95dd2a6b5e0a17e248a5ceab52402277a1e648323d5165
font_01_sfnt_off000119f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 11884 bytes
SHA-256: 38bba66e870f21ebb97bb7300f681278bdea3cd66fc5c5c682f375d19166057d

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