Malicious PDF — malware analysis report

Static analysis result for SHA-256 341661ff472ef447…

MALICIOUS

PDF

83.8 KB Created: 2020-11-10 05:53:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5dccaac761322cc32ecfc0d031f476d4 SHA-1: 261b8adb5ca775f57f25eae74e314e140b7093d8 SHA-256: 341661ff472ef4477462b1ef351ca18ef0cc9c2ef2f700e05a5cb818b98ab974
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://traffset.ru/123?keyword=halifax+co+va+arrests PDF link annotation
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/271339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471711/normal_5fa72994cc16f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387826/normal_5f8e25ca1f14b.pdfIn PDF document text
    • https://wotafoxig.weebly.com/uploads/1/3/4/3/134306194/3726571.pdfIn PDF document text
    • https://gojemafofapuvog.weebly.com/uploads/1/3/2/6/132681271/fesaregekob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412151/normal_5f9f2f7ff3721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417648/normal_5f97370300197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420476/normal_5f98d1e83abc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_5f97ed9f1b3e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_5f982ae9221e1.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/newapuru.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/22630b1c-ad92-4383-ae8a-73b2ec5a4568/97491521573.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/46567555531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62802e73-bfb1-445c-b707-0e998eff8e06/8623175692.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_off00010da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA9 4964 bytes
SHA-256: e0c3e889a51c0530ff773e20d54ec96bacc1f4a4c65f83cfe2a412506c4447c5
font_01_sfnt_off00011ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA1 10748 bytes
SHA-256: e59dff3de76d387b52561b128f637f0a985a1d5c68568042f974fab67eda4816

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