Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d86240a1333c76…

MALICIOUS

PDF

67.1 KB Created: 2020-11-13 11:01:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c014cc537d4ec0f29f624f88e06305c4 SHA-1: 15885fa8569dc6e2fa768ebefcc8ee8552eba6ba SHA-256: a2d86240a1333c766f381ecb7f1a40d9121f654d905c2b1a3a2ccb74e8e1fbc9
214 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's content, disguised as educational material, likely serves as a lure to direct users to malicious websites for phishing or further payload delivery.

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
  • 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://traffmen.ru/strik?utm_term=ejercicios+de+lectura+comprensiva+4+primaria In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5fabce002ff07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413125/normal_5f9929186e37f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_5f96066f447b9.pdfIn PDF document text
    • https://gorigopaf.weebly.com/uploads/1/3/4/3/134341526/5778451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450260/normal_5fa4efc5ecdd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393193/normal_5f9413cc49af2.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/e18a963a-f5d5-461e-8f15-00b864225f1e/claim_of_fact_value_and_policy.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/area_and_volume_of_similar_shapes_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/94150459572.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/section_6_swimming_championships.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/adobe_flash_player_free_app_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/19205137141.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_off0000c6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CD 5400 bytes
SHA-256: 63225b77c9ca8839f7decc50626b94fac4fbc0fa3b588b19231b41cb38f55122
font_01_sfnt_off0000d92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92D 11288 bytes
SHA-256: b064d7f60c0a6b8b3e2628aa837bc952953966f1223bea9e18afca13ac1c370a

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