Malicious PDF — malware analysis report

Static analysis result for SHA-256 b349df40ad7b7935…

MALICIOUS

PDF

67.1 KB Created: 2020-11-14 10:29:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3de1a7a5b13a8a4e7aea0418a50cff67 SHA-1: 9f67debbd6d0e0b50581f5ed39efe06a0bb05783 SHA-256: b349df40ad7b793536136d57737746bebe75855c3a1d6230c4c29d678954f627
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, which is likely intended to host a malicious payload or phishing page. The document body, though heavily obfuscated, contains text related to '2 step equations maze answers', suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=2+step+equations+maze+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366632/normal_5f8f5245a2a81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416930/normal_5f9b145ba5289.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_5f99d7d5467d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388611/normal_5f95e5bc44a8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_5f8a9d2b1bf2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/limewub/munekufonoziraxaxifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3d5837-0b65-406f-881b-13842dd97a68/the_night_i_followed_the_dog.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/benny_goodman_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/gewojefugazenenefepes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae9bd6bb-57a9-4d72-932d-6f18786f7b9f/xuwojukakage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f17e59-955f-451a-a76b-6e34897da52b/32350889154.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30215f12-84ed-423f-b0cb-921a060bec67/43328837409.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb2712d-bce4-4d05-a5a0-1c057154a994/movefevutaja.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_off0000be0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0D 5240 bytes
SHA-256: eff5727a3cc38743c0814c463bf88a573d64deb31a21410daa263006168c604d
font_01_sfnt_off0000cfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE2 15108 bytes
SHA-256: fe91481e52e8ad0aa92bb0de03f8fd62ecb46004084ec4b8633037a13bdcc13e