Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57d442a3bb79a70…

MALICIOUS

PDF

72.9 KB Created: 2020-12-02 02:28:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b521447812b1df18e15ed9902d687f90 SHA-1: 170fb19bf84021a6c317fda35f618c75736fbdc0 SHA-256: c57d442a3bb79a705e25b085db063b5bc473a5f555f65fc9134af8f9e0bb5cc0
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://traffking.ru/123?utm_term=kung+fu+panda+holiday+vimeo PDF link annotation
    • https://lalusaguru.weebly.com/uploads/1/3/4/6/134611329/xaxujuk.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/b861109a-abe5-4948-8343-0e34a3e3dddd/ruwonivurijusivi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4e9661e25426e12f0c3d/1606373014999/4793934927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3c109e-beb8-41b1-9b39-b00dfbcdb848/35996402045.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0b5bec30a162e0c519083/t/5fc2a92df81c9a2a0cf94ca5/1606592814621/84750407562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f4efc66-ff4b-4153-bcf7-cfbec65f4cc3/18272597509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/502a219a-b081-4de4-aa8e-526e050f206a/a_minor_scale_guitar_tab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b7f77b-d460-48d3-856f-c5a1bba42e3a/61199665128.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc293fe0b6b03258f403ad0/t/5fc6d882efc65c5b7a310671/1606867074722/the_lawless_one_mod_apk_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1068cf3-3e1f-4591-a80a-39150e22d7ed/opm_music_philippines_80.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe191bf8cdb769c6ab7da7/1606293796871/basket_case_definition_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d35c4c-6079-4013-874c-5cbb56ff93a3/59826608584.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc4c01f3-b041-406e-a8fe-bdbefef26bd4/dobbie_brothers_19_tickets.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_off0000c863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC863 5312 bytes
SHA-256: fc90b005de6d7543aaa8d327fff72343c785cb30c2364a06d14ff15de9b5adc3
font_01_sfnt_off0000da73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 11416 bytes
SHA-256: 61e7297668ee42332258cb870dd0316260433dc16fedb3abd57d40d91b405217
font_02_sfnt_off00010181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10181 16060 bytes
SHA-256: 9fce2e558c7eba93e9b4ba87b790c422cf9490aab73fe875614431ac3e7f116a

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