Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cf5d3201f4b573…

MALICIOUS

PDF

63.9 KB Created: 2020-12-23 00:29:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 42b64a6d7780e66a3a5391b1f472856b SHA-1: 76a3df9a7b712bcd910f48a1a76140a442feb6a8 SHA-256: a6cf5d3201f4b5732977c0e5bfeac7f1e1a14fbfa1575a3cbc003660ef1815a5
116 Risk Score

Malware Insights

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

The PDF contains a malformed stream and an embedded URI pointing to a suspicious domain, indicating a phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URI are indicative of a phishing lure designed to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://trafffi.ru/aws?utm_term=codycross+answers+group+305 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383460/normal_5fdfaa1e81536.pdfIn PDF document text
    • https://salofapaj.weebly.com/uploads/1/3/4/3/134314320/tujezex_sodozomupow_danixo.pdfIn PDF document text
    • https://piwunosorelid.weebly.com/uploads/1/3/4/5/134590209/4b72b900e04f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc0e081be9b6939510aa493/t/5fccb837c00f007ceae4b93b/1607252028555/tamil_full_movies_2020_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/ghana_afro_beat_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/rojovudokerepiwomelitexok.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/befogoxavixakomat.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/every_landlords_tax_deduction_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/41559195789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2feca2ef-9e29-4f59-81a0-958c9781a108/fulemebaseviludowuv.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/standchen_schubert_sheet_music.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05D 5608 bytes
SHA-256: 76470f6b8da33bf661aa929ab70128222357e047b20b7e0122c646751b8df129
font_01_sfnt_off0000c395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC395 9604 bytes
SHA-256: 0b451a34fe816e102021cb916ab03f923e0b497da647b975eef896d99c1db6b0
font_02_sfnt_off0000e48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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