Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67e90e71b0b2045…

MALICIOUS

PDF

94.2 KB Created: 2021-02-07 11:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 552c41788e316eb1332f55c9d4d7f403 SHA-1: ecfcb31aff86619446aa4cf036afa71142ec4fab SHA-256: a67e90e71b0b20451cedb9a9c6401b776623b5285a6bb4f1106f354a15e69dca
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating phishing and trojan characteristics. The presence of embedded URLs, including one pointing to 'seumenha.ru', suggests an attempt to redirect the user to a malicious site. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=candy+that+starts+with+a+j PDF link annotation
    • http://nncucuucuc.space/puramozunamurvamv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_6015dc99a88a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423471/normal_5fcc03ca30a67.pdfIn PDF document text
    • http://axecheat8.xyz/29072464872i0ab3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419642/normal_600090dec3431.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471960/normal_5ff0e8ba042ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448339/normal_601f711b70ea7.pdfIn PDF document text
    • http://cg-designer.xyz/30065263566qm10c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417675/normal_5fe9d96065053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404750/normal_5fc5b4ce4f6e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369495/normal_5fc84466528b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461770/normal_6003d84ce3937.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501364/normal_5ff7a7a3c8431.pdfIn PDF document text
    • http://doordash.link/xedoguxiwebiwojlj1.pdfIn PDF document text
    • http://itgermany.net/the_complete_guide_to_fasting_summaryk3hnj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467038/normal_601da4156661a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_601f052099025.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_off000132fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FD 5056 bytes
SHA-256: f7744fa8c1f965f17866e18e2243b7822a9eb7c9f94e4a64239748b112a6394b
font_01_sfnt_off0001443d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1443D 11540 bytes
SHA-256: 35d85d929d1e33012b9cacb9038505852ca0cb7fcde2236d0450fabed64562cb

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