Malicious PDF — malware analysis report

Static analysis result for SHA-256 4253d773dbb28712…

MALICIOUS

PDF

64.2 KB Created: 2021-02-21 07:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 473d680bf1f0aba01d59f6f19a83771d SHA-1: 07ad5398bee489c84f1bd98db977cbd29b827be4 SHA-256: 4253d773dbb28712fa3f524734414e09699e6528c60a32270f0e939a41637c65
156 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing or SEO spam campaign, indicated by the heuristic 'PDF_SEO_LINK_FARM' which detected a mass of external links. The presence of multiple unknown URLs, including one pointing to 'seumenha.ru', suggests a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support the malicious verdict.

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
  • 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/123?utm_term=cornerstones+of+cost+management+3rd+edition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413713/normal_601570d7c19d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499319/normal_5fe9789d37737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455380/normal_602ca2393b3ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_60293b74498cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413848/normal_600ddc24e9a3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499329/normal_600470b025574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493589/normal_602b66db298b0.pdfIn PDF document text
    • https://vumetubav.weebly.com/uploads/1/3/0/7/130776444/8543634.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_5fd378405a98a.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/moduxanakuri/sasarulopadulajul.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/blender_3d_books_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/corestate_capital_holding_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/lebosakufixogibiguzu.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_off0000b1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C2 5420 bytes
SHA-256: c7cae09978d16dc86d7fac2911154df50c014a4482a6d8b6c956140e26454813
font_01_sfnt_off0000c416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC416 10284 bytes
SHA-256: f7c9f83bfac2ccc2c6b5388620e4446e1771297df88f71ab2d2a568e3fd1319c
font_02_sfnt_off0000e5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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