Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc0fd344acda4fb…

MALICIOUS

PDF

84.1 KB Created: 2021-02-04 07:00:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: e8aae148b0ee6f9094ad3f6695c66b7a SHA-1: 2791181804d015b28898fba6d51f65fd3e01bf06 SHA-256: 5dc0fd344acda4fb9f8f5511917acff8af020f855af95fad15d9aecdaf24a677
156 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, specifically flagged as a phishing trojan. It contains a significant number of external links, with one pointing to a suspicious domain and another to a PDF file hosted on an S3 bucket, suggesting a potential phishing or malware distribution scheme. The document body's obfuscated nature and the presence of embedded URLs indicate an attempt to disguise malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/aws?utm_term=crystal+reports+runtime+engine+32+bit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422637/normal_60164b0112d75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470692/normal_5fe3e6d1450f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_5fd260a868cf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473064/normal_5fc8a562dd5b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450145/normal_5ff8fb4b20e98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419430/normal_5fda6c7ce4e52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404969/normal_5ff9a8aa58580.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366969/normal_5fc7da31aba87.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/zamuretaduzetuvuy2alz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420434/normal_600d7da215be0.pdfIn PDF document text
    • https://kajubuti.weebly.com/uploads/1/3/2/6/132680994/34444.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://s3.amazonaws.com/vapelurowar/tokugisafuwutodixu.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/89227437924.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 3908 bytes
SHA-256: d6cab86fddc9f24c86ea16188abbe4526c48e1347ac650a52b47c11007ec69d2
font_01_sfnt_off0000fb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB99 5584 bytes
SHA-256: 34f1b4a6aa781f1187485b7608525829635facdc87a7e9742f51362063474077
font_02_sfnt_off00010e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E85 11268 bytes
SHA-256: 2e8de0d559bf33655ec4a722d5fd50a381aed57a9ed70c4eead598a596f58b36
font_03_sfnt_off000134ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CE 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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