Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a57415630bac6c…

MALICIOUS

PDF

69.6 KB Created: 2020-11-23 03:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3da7c60f975266e89cca166b37fca5d3 SHA-1: df4c0a6ee765a33d204e765c30f2807f7fa8f4d4 SHA-256: 52a57415630bac6c870a18efcfeddee76eaf55d81f5eb839b8129155c067f5c4
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://trafftec.ru/123?utm_term=saint+joseph+school+district+school+supply+list PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408176/normal_5fb79f6bbfd39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465147/normal_5fa7153bddd0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_5fa10778f2f60.pdfIn PDF document text
    • https://kevugekakizuxo.weebly.com/uploads/1/3/4/4/134481001/88020354bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393901/normal_5f9aed87d002c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477863/normal_5fa88e3568c0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412896/normal_5fa41fca9a461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375344/normal_5f8a5ef698805.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_5f89d1f836d34.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/6d448178-eeb5-4970-9a86-047d4e623e9e/caterpillar_diagnostic_software_down.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3de1cf5-ba6c-416d-b75b-11ebe863e19d/harry_potter_books_word_count.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ebabd4-dcdd-459f-9ce3-0ee43228ed17/bavuxomobedesupezesusum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e9b92ab-ddac-4cd5-b43c-6c7ce578fce0/wekiwidozeguv.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_off0000d08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08A 5444 bytes
SHA-256: c32180ef0b341c9083bb771b243a279b6ba875e572393359fa3559c82a0cc6d8
font_01_sfnt_off0000e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 11300 bytes
SHA-256: 11614720a402c3226e046981d54e812cb2cfc2209f9c49434b164b02ccb8966b

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