Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dde41742b675a5c…

MALICIOUS

PDF

74.2 KB Created: 2020-11-17 22:28:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 04b1b57015602777197ff4b6e6a86f0d SHA-1: d202e39bb1dcd3c50a8d33bbf34ff099c4da8d31 SHA-256: 0dde41742b675a5c55894b2bfe105752d6a1f2c9ed6c22f44bb8e9b5acafde38
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm designed to drive traffic to potentially malicious sites. The ClamAV detection and ML classifier also strongly indicate malicious intent. The document's apparent purpose is to trick users into clicking these links by presenting a deceptive title.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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://gettraff.ru/strik?utm_term=quest%25C3%25B5es+de+filosofia+sobre+felicidade+com+gabarito In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376866/normal_5f942558b499c.pdfIn PDF document text
    • https://xovelojedawoka.weebly.com/uploads/1/3/4/6/134662979/fudab-pejiw-fiwodaxi-sorudik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369633/normal_5f91213fac045.pdfIn PDF document text
    • https://xuxijewurinawux.weebly.com/uploads/1/3/4/6/134699439/9312876.pdfIn PDF document text
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/terawijasizifiwup.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/rovedatisoxexew_sejox.pdfIn PDF document text
    • https://soxajenukaru.weebly.com/uploads/1/3/0/8/130874283/8532998.pdfIn PDF document text
    • https://jomefibid.weebly.com/uploads/1/3/4/5/134596324/xuwela-goxabuxitig-revewutuxit.pdfIn PDF document text
    • https://gajinuware.weebly.com/uploads/1/3/4/5/134597963/wusetal.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/9031774.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/nobajegogawo.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/8837351.pdfIn PDF document text
    • https://seruliwosudaz.weebly.com/uploads/1/3/4/4/134457931/7968105.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/fbf8de68-1468-4396-a81b-51187f7f160d/partes_internas_y_externas_de_la_com.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03ddf1fa-329f-48d7-8370-04d705607c41/35015596769.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_off0000df37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF37 5760 bytes
SHA-256: 837ab509611e509238ec53306bc96c8e115812c4e50f4d2d346aa83b7b3e0ab1
font_01_sfnt_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 12760 bytes
SHA-256: a6407c6f96bd2c46e58890e3537f053b9f74e7bed44783dd668ad2d76a6e8534

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