Malicious PDF — malware analysis report

Static analysis result for SHA-256 f990227ca5e843f3…

MALICIOUS

PDF

62.6 KB Created: 2021-01-04 19:37:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2d3fd873fdc6fcf725e92792057a0a2f SHA-1: 18252b7b14f1baf9dca193ff6a98ec603dc36cd0 SHA-256: f990227ca5e843f3f70d63032d9dfb456841dbc2281ec881b7d96381b41b6d6e
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or redirection strategy. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://cctraff.ru/aws?utm_term=sample+action+plan+in+filipino+pdf'. The presence of numerous PDF links and the detection of malicious redirectors strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=sample+action+plan+in+filipino+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369781/normal_5f8c12091e237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_5fa8cf3545394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5f8c55ce10e77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380876/normal_5fa09a8742c2c.pdfIn PDF document text
    • https://cdn.sqhk.co/dupeguwova/iedigsG/hat_tricks_delivery_tampa.pdfIn PDF document text
    • https://cdn.sqhk.co/fewisezux/gejabF8/xusoxofaludopefe.pdfIn PDF document text
    • https://mixuvuweti.weebly.com/uploads/1/3/1/4/131483588/gatabuveto-timeretor-wemami-bofozeranupujo.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/webipejonavuv/pitulolaxirawuvifukaw.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/kumoxoni.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/b._ed_scholarship_form_kaise_bhare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fa702f1-b186-49e2-b338-05046ecdac20/my_airtel_recharge_date.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/kajaria_tiles_catalogue_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/ringtone_the_way_i_am.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_off0000b8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A1 5128 bytes
SHA-256: f056b4b8994906c57242eea73e4bbe9c5b72e10325d6951ac7afe9fdcb3b8515
font_01_sfnt_off0000ca07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA07 10748 bytes
SHA-256: 4d3f5506620d3ae67bb21091d9dc12f9d7b567599bcf8a8fdba1965d25e86ae3

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