Malicious PDF — malware analysis report

Static analysis result for SHA-256 2185ec9ec1dda1bc…

MALICIOUS

PDF

78.5 KB Created: 2020-12-24 16:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d9a539baa6c402da6868f20df149e3cf SHA-1: b37c6b0b4af5ddd69777f2eef9fa2ae8da410d80 SHA-256: 2185ec9ec1dda1bc46a64f1b5fc06b38d1c0cde21f959545a3208baf24768bfa
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to potentially harmful sites.

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=www+yellw+com+snapchat PDF link annotation
    • https://cdn.sqhk.co/sawusuzi/IMwAhjK/world_war_2_books_for_young_adults.pdfIn PDF document text
    • https://nogenovone.weebly.com/uploads/1/3/4/7/134745979/1986931.pdfIn PDF document text
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/7eb2f04.pdfIn PDF document text
    • https://zuziraluxir.weebly.com/uploads/1/3/4/8/134899121/perepaze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465147/normal_5fcd504a1416d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403807/normal_5fadddc3838b4.pdfIn PDF document text
    • https://rugurujumififez.weebly.com/uploads/1/3/1/3/131384765/vikuwizatesuj.pdfIn PDF document text
    • https://resonorur.weebly.com/uploads/1/3/4/8/134874279/kujizi.pdfIn PDF document text
    • https://rajotabew.weebly.com/uploads/1/3/4/3/134360909/lumudigojugaxomate.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/kojurufilufopimob.pdfIn PDF document text
    • https://cdn.sqhk.co/mevojazix/ieieHXt/16561039953.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/zijivevip/kixizuleruru.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/antihypertensive_drugs.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/love_song_tesla_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/51525367693.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/738449128.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/criminal_law_book_2_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/73598663256.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_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 5284 bytes
SHA-256: 1baa0b8020cf796d479baeec1e44e22d7c0a71e77ae6a54b81eb614c4670fd8c
font_01_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 12996 bytes
SHA-256: 286c2be4c46191197de3f81223c76bf7373f3f03465e4c3ff95228947df392b0
font_02_sfnt_off00011828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11828 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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