Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e78bf80af9f1e4…

MALICIOUS

PDF

68.4 KB Created: 2020-12-16 23:18:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4a7f41e598ee508affe0f22f60b766dd SHA-1: 95eab34a648d3f9ec8eeb328988a5127ffec9913 SHA-256: 82e78bf80af9f1e4392e9ba8b83890fca9e3d66dba56a2c1b7d947a1ceb61ced
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 0.9997

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://trafffe.ru/strik?utm_term=frosty+the+snowman+book+pdf PDF link annotation
    • https://repenakexo.weebly.com/uploads/1/3/4/6/134600143/dcae3eeb0de70.pdfIn PDF document text
    • https://zazalefofano.weebly.com/uploads/1/3/4/5/134578352/beperum-lugawekuxibe-girufewabelidu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_5fa427442e207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481067/normal_5fb3fcea76af2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_5f88ffa01a3d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460954/normal_5fca2f17f250d.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/7899542.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459787/normal_5fa82ae7d120e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408864/normal_5fa0b2cf20a51.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://static1.squarespace.com/static/5fc7806bfc603311fbfaad69/t/5fc91f2bbd5f2721b0c8ec90/1607016238067/58984346442.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/nizuralaxapak.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/4958870230.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc287be084698658e68a4f0/t/5fd099b1cb6bfe602c53ed10/1607506354827/88807789099.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_off0000c0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EE 5340 bytes
SHA-256: bb6a848d3b1cc0b9fa76778d681c2f89d0fcd1230b36b01fd3be1530a78b7ffd
font_01_sfnt_off0000d2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F8 10448 bytes
SHA-256: 9017a2d2994151b1de24ba5bd80930885b0b8dde9dccb50787a3a17ee6e3f04e
font_02_sfnt_off0000f6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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