Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed820c09d97a1efe…

MALICIOUS

PDF

73.2 KB Created: 2021-01-04 06:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ecb91728d02f70a5f4aded124103db93 SHA-1: 705bfba941b32805bf9a3164e92f71526c2c274b SHA-256: ed820c09d97a1efeae55242f8434ffa294965b480a42554121a92df45718bfb9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the PDF and embedded URLs points towards a malicious document, likely delivered via spearphishing.

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
  • 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://trafffi.ru/123?utm_term=brand+new+jesus+christ+meaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390664/normal_5f9a95e4b90e8.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/156703.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/fasomusogapovi/26102638386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b667ff2-fdf5-453a-bd8b-e0f94dea2ed1/hakuoki_stories_of_the_shinsengumi_routes.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/61789981047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a38fcb-7c00-4fbd-9171-561ec1d5299a/tirisfal_glades_map.pdfIn PDF document text
    • https://s3.amazonaws.com/nefunupu/adyen_settlement_report.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/mozexarelowabevaforage.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/59326948150.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/remamowovusoxiko.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/maxolajetokumamo.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/status_anxiety_alain_de_botton_free_download.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_off0000d2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2ED 5312 bytes
SHA-256: 4ff149a9f515db71346dbd4786a93ab4a7f3d956f05d6e0141c49d400592dd1a
font_01_sfnt_off0000e4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 10912 bytes
SHA-256: 0282b954a8565a06915bfe390204aee4bc3f909b39fbfe3c3d4fbac7406df232
font_02_sfnt_off00010a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A04 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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