Malicious PDF — malware analysis report

Static analysis result for SHA-256 31293fe9634ef6a1…

MALICIOUS

PDF

74.3 KB Created: 2020-12-22 16:13:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c8afad560a8dcbb510006bad2d2b76e7 SHA-1: 973a69340e715da2816e3ed373f3aeb24b5890b2 SHA-256: 31293fe9634ef6a11dc91f10e918caf6ac6804e1592e8946eaddb4bdb8838e27
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://gettraff.ru/strik?utm_term=linenspa+mattress+amazon In PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/xetikigavugekisesis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/play_store_pending_2018.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5a227c6d96458364249a2/t/5fd71304491a58544a2910b3/1607930629482/akkad_bakkad_bambe_bo_episodes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec66722e-af0b-4430-bdb5-a96808414b04/singer_esteem_2273_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50c4ebe9b693951258028/t/5fc56e575147b14804e9eb50/1606774361856/rolikirivobadet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aba207b-679c-4a36-8d30-963f0edf0227/41439002806.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcaa7c5e71df64d6bdd8f6/t/5fdcf6960c2f5b70c40e6459/1608316566672/pfms_user_manual_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b62fc742-aa89-4fd2-9d05-235ff484f363/rutabeluj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d9a6cd1-6031-4fa7-b73a-25daec6133d9/76976276883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87445f65-3099-403a-8fab-7b9ac305344a/joker_stream_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/gerd_ludemann_libros.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc69a80e5c7695ca9c3163f/t/5fca487587b36f46d40c7a59/1607092341258/rj45_pinout_wiring_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/ivanti_workspace_control_admin_guide.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC704 4924 bytes
SHA-256: 49029647ce1691d19912cc67705b7d92771fcc7f0b23e6f24a63e188f616d2bc
font_01_sfnt_off0000d7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AA 11076 bytes
SHA-256: 041cba142c3ab1481270d497e2fa424d8e96db0c23ccf217505139c26b537e08
font_02_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 10900 bytes
SHA-256: 115683ac7b4faef8b8e9b3f8f22faaf570c951c6a87cf807d944b04725af74cf

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