Malicious PDF — malware analysis report

Static analysis result for SHA-256 23965a5bc342daf9…

MALICIOUS

PDF

68.3 KB Created: 2020-11-25 22:31:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: be90e545650220c3393d7490d81c7a0c SHA-1: 8ad979584c202ca5195d7076a7c795e25e64b440 SHA-256: 23965a5bc342daf97e873cd6d4688e2da099d536a1a04c5acf6c692fc0538843
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link to known malicious infrastructure and a PDF link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffmen.ru/aws?utm_term=stored+procedure+vs+function+performance In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419630/normal_5fad711defa95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f87307eee674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f87de371a2dd.pdfIn PDF document text
    • https://kulojimafad.weebly.com/uploads/1/3/4/5/134518235/2434342.pdfIn PDF document text
    • https://nurerimufiwovu.weebly.com/uploads/1/3/4/3/134394752/9114721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5f9414063275a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408170/normal_5f9fcb455dea8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f8c09a0a55d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446765/normal_5fa25e1183ef4.pdfIn PDF document text
    • https://pigupapizot.weebly.com/uploads/1/3/4/4/134480908/e7c5399.pdfIn PDF document text
    • https://kowezuvive.weebly.com/uploads/1/3/4/6/134603832/zozijafanuli_jenisapenax_nalexabewi_sumopilusugon.pdfIn PDF document text
    • https://buziratefe.weebly.com/uploads/1/3/4/3/134354065/3053441.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/c71b0b05-4c61-4305-9a4d-54399089485c/29710787557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5cbf854-329f-426e-a2d2-74395ee86487/l374_pill_imprint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e2d9f44-6fd1-4336-b732-7d242b8c8c28/kef_q100_review.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_off0000cbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDE 5432 bytes
SHA-256: b51154aa250a4498bb44aefd79b02b25c5cb9591d117e46159566aaa4a01ff31
font_01_sfnt_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 10976 bytes
SHA-256: daade46065d8ebd4a196bad843a4aac7031e64aebd552b72f9285a09bad57449

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