Malicious PDF — malware analysis report

Static analysis result for SHA-256 afef2df90b9db229…

MALICIOUS

PDF

62.5 KB Created: 2020-11-29 13:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 58def0968eb36eb7b3394cb6e197ceac SHA-1: bd221a8f1ad2779b5f857084a8cabddb57bb350e SHA-256: afef2df90b9db229f36e85f95a6f02b8963b79edeb40c1aad5e814444e1e9951
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content or for SEO manipulation. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it may leverage embedded JavaScript or other PDF-specific exploits to facilitate these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/strik?utm_term=rocky+hill+high+school PDF link annotation
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/bevazon_vikuvutavitevi.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/ruzif.pdfIn PDF document text
    • https://belafawejogawol.weebly.com/uploads/1/3/4/5/134583754/jakadaworulozazur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458833/normal_5fa3da5973ae4.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/ebb59aaecd1.pdfIn PDF document text
    • https://revokaraso.weebly.com/uploads/1/3/4/3/134320841/9679356.pdfIn PDF document text
    • https://gupufema.weebly.com/uploads/1/3/4/4/134456882/dinojonajexos_veparavopobeku_seledu_nojaxenudinadaj.pdfIn PDF document text
    • https://jutivodip.weebly.com/uploads/1/3/4/4/134489611/6041690.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/wasakudalukitenotiv.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/tikoweravisixu/barcode_scanner_software_for_android_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5997112-17c9-4081-a19f-0e9c152bbb52/zazene.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_off0000b849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB849 4928 bytes
SHA-256: 8fefc4e69fac2f9e03dd2e6d16e1c806577c1994ff59ea132dd3c8427cb71825
font_01_sfnt_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 10732 bytes
SHA-256: 5c99e16ffbd357d2497681d157e7c76dce8e899c89ea0e871d8ea5423700aa2a

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