Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ebfdbd50d2992e…

MALICIOUS

PDF

66.2 KB Created: 2020-11-18 05:50:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b1952198bec7e24120a8fb8c6a2cc8ae SHA-1: bb50729009fd9d2754bf477cf30222e0c074caea SHA-256: 43ebfdbd50d2992e4f44e3c2087eacdf7f225cce04b0d86f979d22c0c998c6de
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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://traffking.ru/strik?utm_term=dmv+written+test+study+guide+california PDF link annotation
    • https://zolefixu.weebly.com/uploads/1/3/4/4/134432518/b2b720e.pdfIn PDF document text
    • https://busiwilepajij.weebly.com/uploads/1/3/4/3/134353274/lukowava.pdfIn PDF document text
    • https://noxutepobop.weebly.com/uploads/1/3/4/5/134510102/229790.pdfIn PDF document text
    • https://sijoxedewi.weebly.com/uploads/1/3/4/3/134346210/0e25dd431c.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/bea12825-029f-4c3e-a434-035bc6465163/nizepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef1fe4f9-a9d7-4174-8b07-f225aea4950f/price_of_ginseng_per_pound_2018_in_ohio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f53906c-cf03-4067-9f21-20ebed5056d1/54178900372.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/sisidezitalabegaraz.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/alpha_projects_and_logistics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79df5516-8952-42f0-a3d6-1234c9cf043b/puwibutekexiwov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd73c4c-4db3-4137-8131-50cd6443a026/nazizavonaxos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0dd603f-41fc-4afa-96fe-f37f1ae1180d/aera_2020_spring_conference_hotels.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_off0000c560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC560 5596 bytes
SHA-256: a7134c11e74b6e5cbc006c49b1256c344b79fc4b2cc305d225a9a37bd450071b
font_01_sfnt_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 10440 bytes
SHA-256: 174b9c152a3f370676a50eec650b3b6962d6c6b6032d3e61f14ce1182b26c6a2

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