Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e26bfda885c7e59…

MALICIOUS

PDF

88.8 KB Created: 2021-01-23 06:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a7e913150247b4f9acfce92adce5b778 SHA-1: 9761bf60e3697e3d1f9864b2e3ac97c665955247 SHA-256: 9e26bfda885c7e59ce588711c829c2bdd5f5bfefc9f8fe5559f4acd903e4d3d3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of external links, as indicated by the 'PDF_SEO_LINK_FARM' heuristic firing. One of the embedded URLs, 'https://jottigo.ru/123?utm_term=garnet+and+amethyst+fusion+song', is suspicious. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malicious content through the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=garnet+and+amethyst+fusion+song PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449618/normal_5ff51e9d36ab3.pdfIn PDF document text
    • https://vigijamavo.weebly.com/uploads/1/3/0/9/130968937/c97e4c67b2fcf47.pdfIn PDF document text
    • https://gopadafuwidu.weebly.com/uploads/1/3/0/7/130740623/gutelilerob_xatavuja_setosimowulo.pdfIn PDF document text
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/a51e27db4ffccc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489976/normal_5fc6a6d76eef8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380545/normal_5fee0bf7612e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413842/normal_60034d1aaa1ee.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/jchjhjb/dr._rockett_houston_texas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375207/normal_600263314fa72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386076/normal_5fc88887f1d40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453747/normal_5fddc7584ce5c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bunakakivukutus.epizy.com/venn_diagram_word_problems_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/buddhanin_sirippu_tamil_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/audit_opinion_report_issued.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/mufatinotofefedes.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/fox_finger_puppet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/1379515327.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10571 5420 bytes
SHA-256: f7bef3352e66f899c9731aefb65ab76198561896ccbed13f79d44fb67675d85c
font_01_sfnt_off000117c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C7 13100 bytes
SHA-256: 721b8a86a1de367a5995e24f7a5de705be9bfc31a3fe64cc1ba8e196c5f6177d
font_02_sfnt_off0001409e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409E 16132 bytes
SHA-256: 895f66822cee8096b629ba52ebdbe333aa959cf625638ac8af8884b25f69792f

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