Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dee0b264a43fac…

MALICIOUS

PDF

68.1 KB Created: 2020-11-21 22:08:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5932d450578cfb631e9a1eed91489310 SHA-1: 11b38c55b188f194ab03d7f1855991aaeb434fae SHA-256: 28dee0b264a43face488914ea18862eb1c9cafefd2cc54ed05aa0de050596c84
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, indicating a link farm designed to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to deliver a malicious payload or phish for credentials.

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://trafficel.ru/123?utm_term=fishers+landing+ny PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365601/normal_5f8bacf73d2fc.pdfIn PDF document text
    • https://rogefiraf.weebly.com/uploads/1/3/4/5/134581109/xiravubisefele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465010/normal_5faa29c442420.pdfIn PDF document text
    • https://gubitujon.weebly.com/uploads/1/3/4/6/134687035/geroxes-nurewitalu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468540/normal_5fb7810fa6671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8701775e7f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449777/normal_5fa8077a33dca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383800/normal_5faeb5a39d64c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f86fa2456802.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/clad_sample_exam_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/83471264373.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18A 3412 bytes
SHA-256: ca41a62c22d128b0e3bcd844ce7892fe134d3a433fa533ca18367b330f9bec07
font_01_sfnt_off0000cdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBC 5144 bytes
SHA-256: 3435803afa386a8cb7bb7ae3efbae07d9734b4592fdf0828880f78eb7855f3ba
font_02_sfnt_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 10604 bytes
SHA-256: 5966249c73079f1bcb75f1828b2bf3be1849325368e704916ac65f1c087df8f1

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