Malicious PDF — malware analysis report

Static analysis result for SHA-256 7771fd39781f880f…

MALICIOUS

PDF

61.9 KB Created: 2020-11-24 05:05:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b3b26907aad0d6cbed99560e80676692 SHA-1: ba13650a45b2c74e1167e033a6e457371979f51c SHA-256: 7771fd39781f880f10de60fb992fc617886aa1000ef8f59462543176104dcda1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other file-hosting services, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/strik?utm_term=conplan+8888+pdf+download PDF link annotation
    • https://wenezobu.weebly.com/uploads/1/3/4/6/134625155/3696965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_5fa2b2c0457dd.pdfIn PDF document text
    • https://sejejuno.weebly.com/uploads/1/3/4/4/134447194/vakikopibepilono.pdfIn PDF document text
    • https://ritixalasan.weebly.com/uploads/1/3/4/2/134265532/gedisuxiwezob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_5f8e00369c85c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f8a6bef9b2b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457862/normal_5fabaf26734ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_5f969db9953fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5fb9257164c92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455196/normal_5fbc67f8deb1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370541/normal_5f9aca324ea8d.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/76debfff-8b03-4984-90d8-67deb6f4a7ff/jubusitijutejado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30431fd9-4f75-4c91-83cd-e1f84ee1d06e/dutijise.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_off0000b879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB879 4952 bytes
SHA-256: 3662359702bcf5a1cd8018edcd936102cb66baf6a11acadb83f0f98f68b87279
font_01_sfnt_off0000c97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97A 9704 bytes
SHA-256: 02e324956331a01ee57f00df80947aaed27d450bd2c4e79754db06a72bafd724

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