Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d437acec0b8e36…

MALICIOUS

PDF

66.9 KB Created: 2020-12-30 01:07:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7361e2c0f67787ea30e3c62674b64a9b SHA-1: 91d1d33408498b1df3e318da70c808299c50eca4 SHA-256: c3d437acec0b8e360c302045441cfc53d00d3d49715167a5679d1e200b6d9ff9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, including a link farm heuristic firing, suggesting a malicious intent to redirect users to potentially harmful sites. ClamAV detection and ML classification strongly indicate maliciousness, specifically related to phishing and trojan activity. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to manipulate search results or distribute malware.

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://traffset.ru/strik?utm_term=pro+referral+phone+number PDF link annotation
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/rekari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386594/normal_5fc7573e46214.pdfIn PDF document text
    • https://vajubepodeno.weebly.com/uploads/1/3/0/7/130776779/powiru.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/29076e8c-4d15-4b5c-9416-367fb4e0af7a/xarixekizupobeniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea56e67e-dcf5-4be0-8e6c-328f82acd614/kaxovelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eba464b-f086-4998-977d-a616abc0d40a/76671864200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c006c3e-f1b6-4a94-934b-9a4c4fc26b50/63370597039.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5139f76-4f14-4fd5-9680-5103f5c1a569/jakotapu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f857710-0094-4bc8-8a94-8aadf1eb8963/faceclin_gel_lm_th_no__s_dng.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece8f4db-2c45-4bdf-9094-6fcc49f4c569/dexerigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcddafd5-fff2-4abe-b711-68f50835aa64/23768004132.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_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 5104 bytes
SHA-256: 2e208b1a0988c9f4bd22cf42e647c16acc21f3e6f31aaf6abde408fec4420a29
font_01_sfnt_off0000dcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF2 9956 bytes
SHA-256: 9d7315718b40556339850a2730bcfdbd11d4716a8b2e909382dbc178017663ba

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