Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fcf15b870795f4…

MALICIOUS

PDF

70.3 KB Created: 2020-11-25 22:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2778475cd66d73e8626c7c9b22243359 SHA-1: b752e36f3558de77b33b255c7bedaeacf300ddd2 SHA-256: a1fcf15b870795f4b029b56275ee2e02473b1fc1bed2ac3d84544db157db7a8d
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded links that point to known malicious redirectors and a link farm, indicating a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs are sufficient to infer a phishing attack pattern.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=boral+siding+installation+manual In PDF document text
    • https://kezaguwubov.weebly.com/uploads/1/3/4/6/134632481/tukavetijimog-zejamuv-fadomubirujero-pumikoperu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f8b1afba829e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_5fbccb0a5f875.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461245/normal_5fa5018f884b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_5faecc5b6fc33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_5fb34e40bd79a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_5fb5f1f12642a.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/geradi/apprendre_anglais_cours.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/friheten_sleeper_sofa_assembly.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/auditory_scene_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/dodegagozamafeje.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/95703397672.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_off0000d88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88C 5192 bytes
SHA-256: 4f164a8610bd7bb85ce3c59b3674024278df520e66571eff15ffde73a4b4b6fe
font_01_sfnt_off0000ea20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 9988 bytes
SHA-256: 1798300a8934da8ae1c606e9fea7e11092c3a44180e7328fbe138dd68e7f5695

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