Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22764abc9206af4…

MALICIOUS

PDF

70.6 KB Created: 2020-12-24 23:20:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7f783544ecb40919f3e8f1f1aa735d93 SHA-1: 9bedeeca9ae32dd67d512fc6abfb07a52b8240ce SHA-256: c22764abc9206af4c4341f5cbc6b0c1f7b5a167aee3a96b2ba386b8412ade1b6
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=meq%252Fl+to+mg%252Fl+caco3 PDF link annotation
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/lujuzugag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458856/normal_5fb3eee617a13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_5f9d2efe0fc8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491432/normal_5fc1c28f44430.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/43332f0e-166f-4bed-bbff-a8e313719b2c/case_study_of_gifted_student_and_achievement.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/gali_disawar_gaziabad_faridabad_ki_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58c83d8e-471f-493f-ba3b-5d771b4729bc/99486773923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9996aac9-23a7-4f1d-98dc-8f650b253210/nikepelibosas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6587a487-c1ab-403f-9448-4aa3729189fd/experimental_economics_journals.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/9292592696.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/dark_cut_4_hacked.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/complementary_feeding_guidelines_sri_lanka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c11264e0-851d-493d-b767-074cc4582226/vufonumukevozelir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66d29d7f-6fbf-4482-acb3-0c2e5dc146da/nomalabadixajekuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea2a9a0-2aba-41c2-9ad5-1c83f8ba74c5/84388037753.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 5176 bytes
SHA-256: 8142973c660561dffcee85a6559d98be16edfd4658ce304290082dabc9638d1c
font_01_sfnt_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 10988 bytes
SHA-256: 06c550872f0a0578e8b51a01860cbb8ff6a0e1ea189b4889748b7e7c28671864

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