Malicious PDF — malware analysis report

Static analysis result for SHA-256 4485403d7042d308…

MALICIOUS

PDF

73.3 KB Created: 2021-02-07 18:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 52971bda68abae46211811c7db8de4f4 SHA-1: e87e06759253dc9acf2d6e21ec47ab7809b1b435 SHA-256: 4485403d7042d308b346b96ce1721ee39bbe9b3c59f14ac8d7f22b3210dcc84a
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 URI pointing to 'https://jacksth.ru/123?utm_term=super+bowl+squares+template+excel', which is likely part of a phishing lure. The document body is heavily obfuscated, but the presence of external URIs and the malware detection strongly suggest a phishing or malware distribution attempt.

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://jacksth.ru/123?utm_term=super+bowl+squares+template+excel PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4468255/normal_5ff52c6418557.pdfIn PDF document text
    • http://kino-vezde.ru/xezaberotukorutebe03hau.pdfIn PDF document text
    • http://negozio50sconto.info/779877227726e9rl.pdfIn PDF document text
    • http://stylecurtains.com/xobexixagupirm7q9o.pdfIn PDF document text
    • http://proita.space/danganronpa_2_class_trial_28zzmq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382952/normal_5febe041d1629.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382614/normal_5ff6b2cb999a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376625/normal_5ffe4f949bc77.pdfIn PDF document text
    • http://igcopyrightforhelps.com/bukegaja0ch9e.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/xisakazelelinim/xogabofa.pdfIn PDF document text
    • http://tugurodegid.rf.gd/moguvuguxemorev.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/27900537707.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/merge_data_from_multiple_worksheets_into_one.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/dungeons_and_dragons_character_sheet_form_fillable.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_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 5608 bytes
SHA-256: 8d40190f3d6bb3f1367da7d86e31c4296838f246998e6882885cd5f4b77d5b41
font_01_sfnt_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 11052 bytes
SHA-256: fec4bf15e0305932bb6ece12c4724359aa6bea9526f6deddf9438df84c6027f4