Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4f2e510a65a241…

MALICIOUS

PDF

73.1 KB Created: 2020-12-25 07:30:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d5431d7c1471c77dc02e266ad8fe01f3 SHA-1: 60a6b8c1396f9d8576d3e5ebf9de559be5cf614b SHA-256: 8a4f2e510a65a241b1b1f6d6d21a65dbd13cac175ab57d9dc82561baf9089fd1
156 Risk Score

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 0.9997

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://trafffe.ru/strik?utm_term=off+road+racing+trucks PDF link annotation
    • https://takixesa.weebly.com/uploads/1/3/4/6/134621412/208db08f.pdfIn PDF document text
    • https://fukusegoboviv.weebly.com/uploads/1/3/1/8/131856281/6079309.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/jbjgFhg/rc_drone_controller_app.pdfIn PDF document text
    • https://weginufakitin.weebly.com/uploads/1/3/4/8/134846544/ziwasejegisefozupof.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/44f52603-5c74-4bb1-8a40-260df5005549/special_forces_books_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c322222-a395-47a1-9ad4-6b3c8e359e4d/57219750506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b80f6e2a-a109-416a-9e53-bf0f2c7e575b/kelunifunoxoruxuzojinilu.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/counseling_case_conceptualization_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b6bf6f-dc97-4932-b90b-c1763c4a97ff/pazagodixirafadonamug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd84e828-1c32-4edb-bc6a-8d8f8b90e239/mefiduf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca91c3ba-91c3-471e-862e-d0c20bc1459c/pabigikaje.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_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 5248 bytes
SHA-256: 6b0c259a6e0a32288c920146edfc7e9518b1661d73754fba129c797bc7703929
font_01_sfnt_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 10536 bytes
SHA-256: 20313c6644859869143e92f10a149e28aa30a9785b7e5be0ecfd215dadab3410