Malicious PDF — malware analysis report

Static analysis result for SHA-256 b821b5515d45f609…

MALICIOUS

PDF

70.6 KB Created: 2021-02-08 15:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 96b5771d01ac2b6501cefd42687254a6 SHA-1: c6c0db360c9aa6fc11a7869f7ddb8bfe1f394bf9 SHA-256: b821b5515d45f6099a5a79a4d73129dcf53c63dbcc72e8c4d06448b121d7fa1b
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains an embedded URL that directs to a suspicious domain, likely intended to trick the user into visiting a malicious site. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of the URL and the ClamAV detection strongly suggest a phishing or credential harvesting 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://bologen.ru/wb?keyword=process%20oriented%20guided%20inquiry%20learning%20adalah PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fd61c75f10e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475987/normal_5fd670395163b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_5fdc398e06274.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377931/normal_60099edb6dd97.pdfIn PDF document text
    • http://natlab.ru/grbl_g-_code_motion_controldqh4s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381988/normal_5fef7dfaa2c89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420608/normal_5fdc083bd469c.pdfIn PDF document text
    • http://it50disconto.pro/851078822666hct2.pdfIn PDF document text
    • http://vvd.bar/xajoket9tlok.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/lupebesu/luxoninaridujixagi.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/9854106837.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/rumosofibu.pdfIn PDF document text
    • http://nemojasa.epizy.com/bhojpuri_gana_bhakti_geet.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_off0000d645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD645 5432 bytes
SHA-256: 8cb8159901a7f336fa799c2214bbea55ae2c8aaecd24319c6f86596dd7e4ef66
font_01_sfnt_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 10812 bytes
SHA-256: 9cb9fe2a20122ccb29e27185b5034e5965d17a3503f42b2a5940ed9d2578e07f