Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be322a5a652abcd…

MALICIOUS

PDF

73.9 KB Created: 2020-12-22 21:33:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0e0b1a7c8561052651b581970e90f3e2 SHA-1: 0e736c6fafe95f4637ac74a9eb471932e823ce3a SHA-256: 2be322a5a652abcdffbdfac0f1fcc11dc707ca546b2879f993b81124d0c11c51
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by multiple heuristics, including ML classification and ClamAV, as malicious. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing software. The presence of external URIs, particularly the one pointing to 'trafffi.ru', suggests a potential command and control or redirection mechanism. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafffi.ru/aws?utm_term=puffin+browser+for+macbook+air PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450354/normal_5faf88bab6f9f.pdfIn PDF document text
    • https://fojaloda.weebly.com/uploads/1/3/0/7/130776233/c22d0.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/6829b0.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/f6c73c2a-b4ba-492d-a4cd-44661c90e345/mokinefadipofuxivilamugaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd1762d-3727-479f-b204-6ff4941b40e7/osrs_crystal_saw_pool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/955f4c59-4371-45ec-a251-f6781ea47034/fazigu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e9bca0-aef3-4e18-b812-fe1b4510ac1a/gowewiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed3968e-9a2c-48cf-bfd9-66356053dac2/nuxawurawerekezibikusiji.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/bexavavosufejuwebofuzoji.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/food_labels_worksheet_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7091a15-ee94-45f0-9c2b-3280366352d4/keliliwolajakab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0524012-1cc0-48ec-aaa4-922e57764e02/rath_ben_10_voice.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/nagokirijiwukapariferib.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/zagifuxisufitelogoto.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_off0000ce93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE93 5292 bytes
SHA-256: ee1347c4e530df21a33dab90288cc277d3cea6ee4ff70ec3232b064d4ac3675b
font_01_sfnt_off0000e093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE093 10524 bytes
SHA-256: e64e15a454311f82f36c6da3c7ac343c06d9c8ebe00124b748be76663751959a
font_02_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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