Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeaa749af9c921c5…

MALICIOUS

PDF

67.7 KB Created: 2020-11-20 11:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 120fce7dae0d395b3c59eec07d86fb50 SHA-1: 2da0ab627a83a429ff831312216ecd8d4b49a884 SHA-256: aeaa749af9c921c52f3eb782a893a9b28fdd36b07518550f2afb5e4e42eeadd6
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/strik?utm_term=proposiciones+subordinadas+sustantiv PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380859/normal_5f93085b15e63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5f944c3780b22.pdfIn PDF document text
    • https://vomediwanuxorat.weebly.com/uploads/1/3/4/3/134327005/kulesuzelobetifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5fab152a1a7f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_5fb5fdaeb982b.pdfIn PDF document text
    • https://xapotitiguwux.weebly.com/uploads/1/3/4/6/134668809/6430821.pdfIn PDF document text
    • https://defusisiz.weebly.com/uploads/1/3/4/5/134599350/696570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_5fb715bead3e9.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/8163316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391037/normal_5fa8ac65e0584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460247/normal_5fae54d175ef8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406191/normal_5f994aab87cb3.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/d021472b-2155-43ba-8e4d-188d98e7359f/vatazujabivizujijetexolu.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_off0000c9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E6 5236 bytes
SHA-256: c04a7a14d3cdb46ef16c6b1d0fd8167afe8a0e4fa52ccd0a82b7d059e85dfb6b
font_01_sfnt_off0000dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 11640 bytes
SHA-256: 0cdd45320cd1803c48e576ab5f93d1779aef93088efdf93a0e9d83443cfcb731

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