Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24f13f293855ba6…

MALICIOUS

PDF

84.3 KB Created: 2021-03-28 21:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 69424482ec16bb01884e8b822e6faffe SHA-1: 1ac5fd3f76c4ad9270abf0813452e8ba8fce047e SHA-256: f24f13f293855ba614548314f1fc04288891474052f5902d0ff37095de08f7a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to Weebly and other free hosting services, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/award?keyword=fur+elise+pdf+piano+sheet PDF link annotation
    • https://kuwovewifinux.weebly.com/uploads/1/3/0/7/130775990/dazadeweranosifol.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • https://nonovobuzodeku.weebly.com/uploads/1/3/5/3/135348203/4203753.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/jf0hdE2/teen_chat_for_teenager_app_download.pdfIn PDF document text
    • http://secret-empire.ru/42359777848pj8zi.pdfIn PDF document text
    • https://manesufepal.weebly.com/uploads/1/3/1/3/131381078/2ec8b46.pdfIn PDF document text
    • http://kyhni.site/where_do_you_get_bubble_tea_near_medvic4.pdfIn PDF document text
    • http://afracheat7.xyz/sentences_and_fragments_worksheetsudk9y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/feseni/10044187879.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/sufanowojulozapeze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0551c8c-03ce-42d0-9920-bde05052b2b0/mazuxupirumodaki.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/28621780454.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/snow_white_witch_meme.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/case_study_template_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b809e0a-7aec-4e1a-b316-1783c546e0fb/39378706566.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/brain_on_fire_book.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/86639150110.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/16359650864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3bd4eff-52eb-443d-aa68-80ff0ec3654a/703629261.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_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 5084 bytes
SHA-256: a01c15156b4e5cb7a097762a6e5fa2eee6cab9364029e73c0e678dc94bfb35e1
font_01_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 12324 bytes
SHA-256: f472087967347e072dfd6c8fcc7fda857267d28032143f338f831fa79e778c35
font_02_sfnt_off00012d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D80 16120 bytes
SHA-256: 184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832

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