Malicious PDF — malware analysis report

Static analysis result for SHA-256 90694913b194f1ab…

MALICIOUS

PDF

72.2 KB Created: 2021-02-11 12:48:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: da2474a56456e3bcb63216df862ccdcb SHA-1: d5f56baf88dc0f0676c732200c344af369209403 SHA-256: 90694913b194f1abed5f13d6c213ff24d497fb9970ffa9846e09ac40e1f18967
156 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. 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
  • 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://crophysi.ru/123?utm_term=silicone+nose+pads+for+cpap PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456984/normal_5ffb39b0be20c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426271/normal_5fe724c104835.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388160/normal_5fcceb7876a0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384295/normal_6019bbfae4268.pdfIn PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/3fe43f039793.pdfIn PDF document text
    • https://bolefusugo.weebly.com/uploads/1/3/4/8/134868203/733035.pdfIn PDF document text
    • https://cdn.sqhk.co/puroneruk/ie0uORO/69727573027.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459784/normal_6008eb77bd0e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454546/normal_5fd0f1eee9631.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449395/normal_601d88549aa00.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/bIu2g0S/73324150846.pdfIn PDF document text
    • https://zemibojonu.weebly.com/uploads/1/3/5/3/135324970/7738575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459188/normal_600bc78839477.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/bokexizometun/jazz_easy_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/tamanawutafekibogoke.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/99582124916.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/41122076689.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_off0000ddb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB8 5252 bytes
SHA-256: 1c22b543859e30604f96d07afe55586a39ad6e22daa39a3e820e46d5e7893633
font_01_sfnt_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 10544 bytes
SHA-256: c94b4438e0323d102d8bead47f7e4e74dc81a9c7608bd671d0fb742040af056c

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