Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c57ebae3384345d…

MALICIOUS

PDF

68.5 KB Created: 2020-12-14 11:55:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a70734f857870e48395c9ef8f38d7c67 SHA-1: 9b7a2476918ab26359c9d55566920ea0d994e976 SHA-256: 0c57ebae3384345d0b8447f46850e8ae6e195c82b609127fd90d136efb26e949
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the extensive link farm designed to redirect users to 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
  • 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.
  • 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://gettraff.ru/wb?keyword=capacitor%20ceramico%20102%20datasheet In PDF document text
    • https://static.s123-cdn-static.com/uploads/4382639/normal_5fcff3cdc31e7.pdfIn PDF document text
    • https://xumuxurubaxuk.weebly.com/uploads/1/3/4/5/134501003/xoxajubunad.pdfIn PDF document text
    • https://zejibafubetu.weebly.com/uploads/1/3/4/1/134108860/kagafoxiv_livosizib.pdfIn PDF document text
    • https://bexizesuxeneze.weebly.com/uploads/1/3/4/6/134634073/6870869.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449004/normal_5fa170f9b23de.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/fenatagazise/brand_manual_template_indesign.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/fuwerawejomoponek.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/bellevue_college_module_1_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/printable_coloring_sheets_of_cars.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/sachem_north_high_school_staff.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/gutiropotevuzolafo.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/logo_quiz_level_6_all_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5e5b145a8629dca8a226/1606377051837/77570063083.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_off0000cae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE3 5512 bytes
SHA-256: 86f2b441937fa5a780059c021c24dc62b9bfe9f55b6a4a1887975ffeedc65191
font_01_sfnt_off0000dd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD72 11664 bytes
SHA-256: 1562f7712fc7174224a861399a5329f7e2950148cdcc6335276a0ede46455c8c

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