Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7bb57e0c8c9f50…

MALICIOUS

PDF

88.0 KB Created: 2021-03-30 17:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c90f29b893408f1ad3ad8c6f8cce930e SHA-1: 57cc63de33cca1df5e8bf31687014a93b76013d4 SHA-256: 3c7bb57e0c8c9f50d470b61011e6c056d4b4c0ab598cc411a556366ff1dc8754
104 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and heuristic firings indicating it is a phishing lure, specifically using a fake invoice/payment pretext. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the presence of external URLs implies a download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/award?keyword=principles+of+business+information+systems+pdf+download PDF link annotation
    • http://voirly.xyz/bangalore_to_chennai_shatabdi_platform1xjgq.pdfIn PDF document text
    • https://junezemojevav.weebly.com/uploads/1/3/2/7/132740237/terufowe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488323/normal_5ffaafe43222c.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/gjbPhfV/widubabiniwefikawiwogogil.pdfIn PDF document text
    • https://cdn.sqhk.co/pamezuravuno/Vedhb8l/84494050270.pdfIn PDF document text
    • https://vadizomozizi.weebly.com/uploads/1/3/5/4/135400682/banixopuzumoles.pdfIn PDF document text
    • http://creditstar-kabinet.com/111291935332fpcy.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/DShaahe/wedikiginosujiju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402964/normal_5ff6708195e52.pdfIn PDF document text
    • https://disepijov.weebly.com/uploads/1/3/1/4/131438002/0f017771cc4.pdfIn PDF document text
    • https://rofoxanubojinud.weebly.com/uploads/1/3/2/7/132740779/3885aee09fd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495837/normal_605971415ebb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414849/normal_5fd2e656024a5.pdfIn PDF document text
    • https://rasegopejut.weebly.com/uploads/1/3/4/3/134317160/4520489.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/ruzumeb/chiral_and_achiral_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/hoodoo_ski_report_weather_forecast.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/free_printable_literacy_worksheets_ks1.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/41636813539.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/what_are_electric_type_pokemon_weak_too.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_off000117bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BF 5636 bytes
SHA-256: 28688b85d99129dda8a1812114c66df8d79f3aba6f12c8e9813af97bc9ea8fc6
font_01_sfnt_off00012ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE1 11708 bytes
SHA-256: 7e54a937c2e9ec72734b41e0a8357c95903a2888b95769bb18d2ad1000df7785

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