Malicious PDF — malware analysis report

Static analysis result for SHA-256 3878682462feff94…

MALICIOUS

PDF

63.7 KB Created: 2020-11-18 10:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 12c0f7d52948104c4bb4539d0b18f203 SHA-1: e6c147e7b406e2c7c989f2b0edc169b38508d388 SHA-256: 3878682462feff949853b9fed017bfec3c8c7197f9c3f0933e421f7341231d06
184 Risk Score

Malware Insights

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

The PDF file contains embedded links that point to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent. Although the document body is heavily obfuscated, the presence of a link to 'cctraff.ru' suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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 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/123?utm_term=indefinite+and+reflexive+pronouns+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403273/normal_5f95b89e7af76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_5f92ee436b98d.pdfIn PDF document text
    • https://mosozedap.weebly.com/uploads/1/3/1/8/131856454/fonitixuluxa-vokeviperalas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416332/normal_5f969b51b90df.pdfIn PDF document text
    • https://kepijiloxa.weebly.com/uploads/1/3/4/1/134108658/a88ab721ca0c187.pdfIn PDF document text
    • https://balejumefem.weebly.com/uploads/1/3/0/8/130814467/3761059.pdfIn PDF document text
    • https://tulebowad.weebly.com/uploads/1/3/4/4/134467329/975de3b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421217/normal_5f9ef622bb935.pdfIn PDF document text
    • https://warajepij.weebly.com/uploads/1/3/4/6/134608856/dozefivavidularumak.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/jevelel/jax_guide_mobafire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59a34517-6720-413e-88aa-02834d226cce/rashid_electronica_de_potencia_3_edicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e446162-536e-45f8-8c9f-39339526fea0/29507986490.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7e97743-2c4d-4656-ac69-cadae56c16f1/zuwadorusikud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad493fdc-1a36-4418-a843-423aae4ce743/sitokoneroja.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/39355759940.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/32479160522.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_off0000b992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB992 5352 bytes
SHA-256: a9d7e1740a6dc4fa8d48b7754f513b5f67a18b7248349cc60ae151478a2a7967
font_01_sfnt_off0000cbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD9 10836 bytes
SHA-256: f94084043369b4ce2f6e4e7d60df68e0095e79e88addcb8665416021c6a44b36

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