Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c2d34540494cf1…

MALICIOUS

PDF

73.4 KB Created: 2020-12-22 07:45:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1b00bc06247e20e0f16904b4097943db SHA-1: 5c5485ca458ebb8fb721d3faa1d5a4822c2ba278 SHA-256: b3c2d34540494cf180984085886f025f475378612c09c7d98dcd4699205cd7cd
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://traffset.ru/123?utm_term=cryptography+worksheet+breaking+the+code+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403818/normal_5faa3e2caceef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420431/normal_5fcb47e9774d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_5fae697c22a7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445114/normal_5fb3022757abc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411491/normal_5fc4ab49eaec0.pdfIn PDF document text
    • https://lowisaxov.weebly.com/uploads/1/3/4/3/134361609/jifowurewapuma_bizeze_xirume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424647/normal_5fa2f8fe4c600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_5f8994d7c8341.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451565/normal_5fc4bf4c5df65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474989/normal_5fb812b4a6e71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492600/normal_5fb888c33abd8.pdfIn PDF document text
    • https://zudovizu.weebly.com/uploads/1/3/4/3/134338339/4214151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_5f89c0a410934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413862/normal_5fb3528775a74.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/tetazino/i_can_t_be_bothered_doing_anything.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/jiradalolenokawozimij.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_off0000dfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 5604 bytes
SHA-256: 51d33c596a6ecad018297213760726993e5b4df851e40dfc4054102a8b4c5ac3
font_01_sfnt_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 11028 bytes
SHA-256: b6fa3caddd1d8bae843da7636307cc1016d614e0324df9b6980fe142edb2beb2

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