Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec77b87bce013baf…

MALICIOUS

PDF

62.1 KB Created: 2020-12-05 03:50:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d3be271445b9fe6736e4c1a057dbdc86 SHA-1: 5ff76f75889e3d51fbccf50f98b3e71e4403820e SHA-256: ec77b87bce013baf3e8877af3071662ee1bbda5c9e1f2e588d2da558c74d709f
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection, likely to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffine.ru/123?utm_term=correctional+lpn+salary+florida In PDF document text
    • https://kefobisow.weebly.com/uploads/1/3/4/7/134733217/058c794052.pdfIn PDF document text
    • https://lonopowixeza.weebly.com/uploads/1/3/4/6/134620564/binebolepuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366367/normal_5fc63e79591b8.pdfIn PDF document text
    • https://xoxujodega.weebly.com/uploads/1/3/4/3/134363828/riwovimu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451737/normal_5fb3d7a82655a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472491/normal_5fc0bf407a339.pdfIn PDF document text
    • https://kovelikazaw.weebly.com/uploads/1/3/4/7/134705675/2c0661d2cf497.pdfIn PDF document text
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/bidamolusasap-puwomod-tapemaj.pdfIn PDF document text
    • https://renudufodajofi.weebly.com/uploads/1/3/4/8/134884992/7247192.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386607/normal_5f94ca540103c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373511/normal_5fc575f8ee0d2.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/e13a1822-8a2f-41c6-8b0c-cc88997fdf15/jesse_stone_series_reading_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e81adcd-edf8-4af3-8b52-ecf5ef624a70/wawovesuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbf34eb0-f674-4421-afda-53fc860087f1/62251127626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cfc26cb-02a9-487f-b464-7942bbbc1602/81745415555.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_off0000b4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CC 5156 bytes
SHA-256: 1227de15207ca176e2f0cbf028da68328082cd9e1ba999781cab0ff18091c980
font_01_sfnt_off0000c66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66C 10740 bytes
SHA-256: 8950f671a981c97876bc9beff42cd9c6c5497fbc2eee8ced81df3b4c50288c00

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