Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c63cd7f35aac843…

MALICIOUS

PDF

87.4 KB Created: 2020-12-24 22:14:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 79bcb27fc23fc0b78a9dd6c789220e59 SHA-1: 198f139d5373ac5cba8eb90ab44ef2d0483c4255 SHA-256: 3c63cd7f35aac84305b0a7a1b105ee8eb29597291ac6c5aa364cb5b73666e504
244 Risk Score

Malware Insights

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

This PDF document functions as a link farm, embedding numerous URLs that redirect to potentially malicious sites, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document's structure and embedded links suggest an attempt to lure users to external, untrusted content, likely for phishing or malware distribution. No scripts were extracted, but the presence of many external links and the ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/aws?utm_term=fraction+number+line+worksheets+grade+5 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_5fd834972b85c.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/tubad-zimajigezur-wosoli.pdfIn PDF document text
    • https://cdn.sqhk.co/bumadawab/iagginQ/artillery_ridge_campground_pennsylvania.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/dGAifc2/nuvawigab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f86f86cd36ef.pdfIn PDF document text
    • https://xoretewajojuso.weebly.com/uploads/1/3/4/4/134474148/padijof_denudenamutuke_gafupepoj_zisigarenarimaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_5f8f1613b58ed.pdfIn PDF document text
    • https://xebagaxasu.weebly.com/uploads/1/3/4/8/134878678/3182564.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_5fbb6a2a80de9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484636/normal_5fc0173224c26.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/nijulavoniret.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/bopuxosavubare/negative_prefixes_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfc4a5ca-0515-4b1e-8977-8d2a23afa69b/homemade_gf_porn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3346ac97-27f8-4803-bc46-81fa378329bf/65397376499.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/guided_reading_activities_for_year_3.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_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 5728 bytes
SHA-256: f5e2ef6d7e17d8c8bec625edb533426309c360fd49d9cbc2dd63df51df7a74e5
font_01_sfnt_off00011537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11537 10532 bytes
SHA-256: ce77915259965862b3eaca3478d724bba46a65fcf34338f857d455a8c3a707f2
font_02_sfnt_off00013933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13933 16176 bytes
SHA-256: 8571c69df712043f52364268a050b27bc1059f3809e3f2b49cbb8768f33e3ff2