Malicious PDF — malware analysis report

Static analysis result for SHA-256 f92be36fa9cb7490…

MALICIOUS

PDF

67.9 KB Created: 2020-12-27 00:10:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c38340973713a289e3ac592a21906d57 SHA-1: 0bf40de9a1c4fd0c84291c6e1d318c3294897203 SHA-256: f92be36fa9cb7490b0cb0a37c6df5e953e5d772daa11590ea2865a74b444e428
156 Risk Score

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 0.9981

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://traffnew.ru/strik?utm_term=storybeat+premium+apk+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373243/normal_5f9cd56203e4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5fbe70b574df7.pdfIn PDF document text
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/tapalisizemef.pdfIn PDF document text
    • https://nixawajumumija.weebly.com/uploads/1/3/4/3/134338940/wibifezafosuropumuwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450046/normal_5fbc9f5583ced.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/f3fd37ec-40cd-4a27-8155-3ba8e8baa4ee/industrial_craft_2_classic_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6ee2298-a90e-45ae-a29a-ae4d6ca4eaa0/vetorarazuweveralukuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f352ea7d-29ab-4cc9-a462-942b9925ac2e/las_cosas_mas_caras_del_mundo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/698a1f1d-ae38-4cd1-aca3-09a4f4bd3e9c/23434259637.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_off0000cc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC14 5508 bytes
SHA-256: eb44448366a70a24dc36fc98a4ff99834a05a4168d9700593be9832d68d692ca
font_01_sfnt_off0000ded4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED4 10536 bytes
SHA-256: a2bf063b10d368891e09d3183111d4af86ae7720aa375ec54717c7d31a31575b