Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc1cbe5ef844e06…

MALICIOUS

PDF

63.9 KB Created: 2020-11-12 17:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c953d28e434ca41a37aae0464d721bec SHA-1: bb42f0aa3b8aae26aead0568bdc720e7afbee97f SHA-256: fdc1cbe5ef844e0638db3c48a97ec47c4cd5d2f6b906dbd7d12ab6c5b5ff1748
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to downloads, suggesting a lure. The presence of numerous PDF links, many hosted on file-sharing services, indicates a link farm designed to distribute malicious content or phish for information.

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://traffking.ru/123?utm_term=rollercoaster+tycoon+1+download+android In PDF document text
    • https://nugaginidej.weebly.com/uploads/1/3/4/4/134475369/2616998.pdfIn PDF document text
    • https://wogilaxafa.weebly.com/uploads/1/3/4/4/134479860/936c6eea0978f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_5f95d51dc7d54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f94c943e499f.pdfIn PDF document text
    • https://lavigumujow.weebly.com/uploads/1/3/4/4/134438710/kafiteduwawejek-govusebepobidub-dowukaje-fuwirowunibi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446045/normal_5f9e681ca9fce.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/5793ea67-bca6-44e5-8bdb-5b9ed4fe7142/19373486440.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc48b64-8991-4a3b-bde6-fbe468334ac8/libro_desarrollo_organizacional.pdfIn PDF document text
    • https://s3.amazonaws.com/gatiwaraluva/52933354923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53304b9a-5984-44c1-8a9c-399d77f88fb8/stanley_golf_course_nd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eca4ed2d-edd5-4e9d-8528-b188719eed63/youtube_christmas_vacation_-_movie_soundtrack.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_off0000bd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD09 5184 bytes
SHA-256: 9c9c4afb2f07038180cc3b8b720a2acf023bb506bbc2dd85c054cc351ba7e880
font_01_sfnt_off0000ced9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED9 10452 bytes
SHA-256: 2e9fd7e37d2cd2467d66bf582d1fd86256202f4c139a52d73116143e5f1b1fc5

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