Malicious PDF — malware analysis report

Static analysis result for SHA-256 c413a99095367674…

MALICIOUS

PDF

65.2 KB Created: 2020-11-14 06:29:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0de90c3367ac2a8dd23b196d60383fac SHA-1: 9b275d8b657270f03e456138d1f0be71002e4f9e SHA-256: c413a990953676742294ebfb1a3f60ebf470e79de4db53eb77aa7b1f24fe00f9
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://trafffi.ru/123?utm_term=exhuming+of+a+nation+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369651/normal_5fa98341d95c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_5fa28709676bb.pdfIn PDF document text
    • https://gozarijaleb.weebly.com/uploads/1/3/4/3/134337750/pesumuk.pdfIn PDF document text
    • https://jimagofer.weebly.com/uploads/1/3/0/8/130813953/f5a28c050c.pdfIn PDF document text
    • https://jijidiwudop.weebly.com/uploads/1/3/4/4/134481930/lojokunazikeletizar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_5f87a85fa26d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383579/normal_5f97e09a600e9.pdfIn PDF document text
    • https://bonunobomatujo.weebly.com/uploads/1/3/4/3/134318799/zofij.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/jofunozuzof/dododedumu.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/54147045436.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/44844787193.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_off0000c286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC286 5176 bytes
SHA-256: 301b9849c41771dd4bf47fcf18d444eae3d552d74b983151cc565357d498aa30
font_01_sfnt_off0000d40e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40E 10556 bytes
SHA-256: b20664e86d353537dc340956b8fef96024b158a82195507cdc7cb8c69c56193f

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