Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf06a23d773e990c…

MALICIOUS

PDF

64.4 KB Created: 2020-12-18 01:04:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 12d05474fd103a3e57d242b8d0e08d3e SHA-1: 98abb79e69db9b0d669890d45e012cc659b16fa9 SHA-256: cf06a23d773e990cc9f1a15fb336485c83d98a17228f5fc7529072c857f485a4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier, indicating a phishing or trojan threat. The document contains a large number of external links, suggesting it is part of a link farm designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and the presence of external links strongly suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=sh+ch+th+wh+worksheets+pdf PDF link annotation
    • https://dakubazelup.weebly.com/uploads/1/3/1/4/131454222/4f548e62256fc8.pdfIn PDF document text
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/titememopafevovowo.pdfIn PDF document text
    • https://delimilakemasuj.weebly.com/uploads/1/3/4/4/134400920/gotezune.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/2045193.pdfIn PDF document text
    • https://sujofunipus.weebly.com/uploads/1/3/4/5/134502209/burokulumo.pdfIn PDF document text
    • https://gojafone.weebly.com/uploads/1/3/4/8/134891791/vuzuteralu-mujet-muvexopite.pdfIn PDF document text
    • https://kagilomit.weebly.com/uploads/1/3/4/6/134669997/47f79895.pdfIn PDF document text
    • https://rimosuvifakub.weebly.com/uploads/1/3/4/3/134310068/nasetid_kuduvawaruk_risabibariwax_nuxefufizavuni.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/totanedonobuxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/nau_2019_2020_academic_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/waletibive.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/debiz.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/five_business_level_strategies.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/ginobam.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/jinejulejazavobokarove.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_off0000b53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53C 4892 bytes
SHA-256: 620c18ef8f7b367e0c02b9376a70ce1d40ea111ba66db74d65504358a2b6601e
font_01_sfnt_off0000c5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FF 9596 bytes
SHA-256: bf113e6d0fea60a32ac1fe6b36564d983ba8be6a6cc7d87017e881d147307cce
font_02_sfnt_off0000e6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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