Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c511445d6ef4bcc…

MALICIOUS

PDF

76.7 KB Created: 2020-11-17 21:16:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a117170a47803e0acc3fd4a3c7af5e10 SHA-1: 9d587771df3749f06d9dcd4b64244516b6ed48b8 SHA-256: 7c511445d6ef4bccbf6f5da022989f8ead2b9734b102073b1124c2cfa6aafe80
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=philips+hd9641%252F96+airfryer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465687/normal_5faa3bfb7f648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_5fa09ab326a3f.pdfIn PDF document text
    • https://posodukur.weebly.com/uploads/1/3/4/3/134347560/461262569ec51b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_5f8854db192ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5f891f2aa3f9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_5f9c7aa554acb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_5f9003528dc92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407998/normal_5f9a774fb7aad.pdfIn PDF document text
    • https://tijabitosivu.weebly.com/uploads/1/3/4/3/134396728/fodogexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452173/normal_5fb3216f57365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410030/normal_5f991c3524ee2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417145/normal_5f97c93382a1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465006/normal_5faf8e8b5f779.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/castrol_logo_vector_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26018916-0a10-414b-a6eb-2fea85e5fab4/scanners_head_explosion_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/fokokawakilaxisumijigaxo.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_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 4036 bytes
SHA-256: e51b6df57cfd18212834dc468e07939dd68bfc3d6e1f556a9cb554f495334a24
font_01_sfnt_off0000e79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79D 5720 bytes
SHA-256: 0c2fdeffdde5ac7e3e2d008b089a5283f146a9731f4b09ff5666d8898bedebcc
font_02_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 13996 bytes
SHA-256: ecef3d0e3fc49d29402729b69d211ba02937080e77e99b2bc63065fbcb4acc8c

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