Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30dd14ee3e831fe…

MALICIOUS

PDF

66.3 KB Created: 2020-12-24 15:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2e7d3ccf6b978df7cfe39c88ca6baa7c SHA-1: 1dfbec46912f0593644ccc3d555f875cf0d578e0 SHA-256: d30dd14ee3e831fe9d58991bb25780e2aae8bdc29e37b90d67a2748d43a40210
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a significant number of embedded URLs, many of which are hosted on disposable domains, indicating a link farm. Several heuristics, including PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM, confirm this behavior. The ML classifier and ClamAV detection further support the malicious nature of the file, likely used for phishing or redirecting users to malicious content.

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
  • 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/123?utm_term=ccny+math+department+advising In PDF document text
    • https://cdn.sqhk.co/lofopapenow/RVqY0H4/89339455014.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/jjJhfgh/hangout_meaning_bangladesh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477629/normal_5fbb10a72de79.pdfIn PDF document text
    • https://tabupuja.weebly.com/uploads/1/3/4/6/134647436/0c56cf0.pdfIn PDF document text
    • https://petarukezatu.weebly.com/uploads/1/3/3/9/133997491/gaxuzejebusakemax.pdfIn PDF document text
    • https://govotewimodiku.weebly.com/uploads/1/3/4/6/134649218/cae5612fae2fe51.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/6736804.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/voxexinelosiremejas.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/vunijakekagakok.pdfIn PDF document text
    • https://cdn.sqhk.co/makafabakuna/bhevtZ6/joturaduwitovolevon.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/jikopot/llamar_a_telcel_para_reportar_celular_robado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2fa30ba-2d43-46ed-a4df-321b936a87c1/64776083155.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/interview_format_3_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d729a5ed-0f56-4adb-b2a1-b933097b56f6/90675946286.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_off0000c5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B3 5524 bytes
SHA-256: fcef64f3265a299c5e85f4ab72b15ab40f2cb9402f2d5534802df5051f3c86a2
font_01_sfnt_off0000d858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 10708 bytes
SHA-256: 7f22189f0de55232f57dc031e0e05c68c7bfe27f2aae44eef9fb9bef43e0c4fe

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