Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd0621f681df307…

MALICIOUS

PDF

73.4 KB Created: 2021-02-18 08:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 416222ccc791e100dbb92d29e34bba10 SHA-1: 96b1873eda5ac06320eb3a5fc69b794fd1720287 SHA-256: 4fd0621f681df307a1dd223a526776582772c03bd301a4141f1a323a8173405f
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL pointing to 'baarspo.ru', which is likely used to deliver a secondary malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to fitness, likely to trick users into clicking the malicious link.

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://baarspo.ru/strik?utm_term=how+to+tone+up+legs+and+thighs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374956/normal_60273e8b33c6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381980/normal_600fa5f4e314c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421062/normal_5fe56b5c3b807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422637/normal_5fe642d10e236.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458839/normal_5fedcb91e001e.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/bfhghgh/kefexepawi.pdfIn PDF document text
    • http://ozalupa.space/printable_fax_cover_sheet_examplexbv5i.pdfIn PDF document text
    • https://cdn.sqhk.co/dedatemaran/cmbfihX/guxogupomujotu.pdfIn PDF document text
    • https://kivisibef.weebly.com/uploads/1/3/0/7/130775328/7cced00075b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481289/normal_5fea1d1dd9916.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458839/normal_5fc76cbff1a33.pdfIn PDF document text
    • https://cdn.sqhk.co/kulukopupiw/B4jhjai/.pdfIn PDF document text
    • https://farazekij.weebly.com/uploads/1/3/4/3/134379469/f70500c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496812/normal_5fd989017cad3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 5180 bytes
SHA-256: b1cb2b82959f505c8918fbf6d91f6164f56cee5860a0333a2dbd32378095c4df
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 12364 bytes
SHA-256: 128a5ca0e162ddb08aa8abe29f612eaacf7f3f1c90007cdd055c99e02aae72e0