Malicious PDF — malware analysis report

Static analysis result for SHA-256 4adf4c39a3322a2b…

MALICIOUS

PDF

83.6 KB Created: 2020-12-05 13:56:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b271dcbfa194379bc476149687455941 SHA-1: b44dded56f3761a4e0b7241356840dcbef676c41 SHA-256: 4adf4c39a3322a2b3dc6af2e1da78f96b66f127469d7c2a90ac0f10cf789e74a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded external links, many of which point to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic and the ML_NYX_PDF_MALICIOUS classification. The ClamAV detection further supports its malicious nature. The primary attack pattern involves using SEO-like link farming to distribute malicious content, likely as a phishing or malware distribution lure.

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/aws?utm_term=introduction+to+calculus+volume+2+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5fae7c2b21d80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424330/normal_5f992b14de4dc.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/4021974.pdfIn PDF document text
    • https://fidinavaxevipew.weebly.com/uploads/1/3/4/8/134876378/semat.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/4824abc5-3bd2-484a-a829-e426c5637908/vitekatukovutepefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1166fb2e-05f6-4a95-9b4e-f62a90c94208/complete_prophecies_of_nostradamus_free_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9936ff47-dd26-44f9-b20e-8f76cb880ab0/60712641348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7196c9f2-f13f-457a-98df-2c5e7722660b/naxomaxijikuxazesefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e515148-56c6-4556-a0f4-37bcd59ea502/taxov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ebd1e5-a604-487f-93c8-896d60995d56/bameroralofovaferupi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a51967b-09bb-4590-8d81-d407d5ff5a01/muwagelaxukin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1be396b3-712b-46a2-a04e-81646b5a60a0/lodiusd_teacher_calendar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e295006-350d-4d0f-bc32-e50dfdd62af2/81526326560.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0D 5428 bytes
SHA-256: 962ba9764a39b651dced7cf7f8d6b39dcc3dd113d2808d2e0a43542ff9b1fb4d
font_01_sfnt_off00010177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 12420 bytes
SHA-256: 570d09712cdcf50e62e0a3a26580ee226b9667fb66b6ba91ed935ac63b3c0184
font_02_sfnt_off00012b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B98 16152 bytes
SHA-256: 107dd7461bad0ee7f69ec232d7edbfa51533cbe03462e0930b0bd999c9024e27

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