Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc952e7419c83f8…

MALICIOUS

PDF

75.2 KB Created: 2021-05-27 21:21:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cc6783640ec9485994fc0afedd10be63 SHA-1: dcf73b4ecfa3c0b59196c507df5f87830e79dfcf SHA-256: dfc952e7419c83f8b6c1432cd568f0b45a6d0fa36f6a36cbf9130d69260919ee
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 0.9995

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://vilenefex.ru/123?utm_term=maths+genie+bearings+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367959/normal_602f111d32694.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368746/normal_600119132c70d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487416/normal_606b5a7ce3d0b.pdfIn PDF document text
    • https://fuguweraxawu.weebly.com/uploads/1/3/4/6/134684603/fawuvotu-vupoguvigogegew-fevuni-lomuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453890/normal_5fd9f38fb8b2a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474465/normal_5ff1ceacdc5c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_5fd645168b314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489593/normal_60696d5e728dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_60691a00ac02b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475739/normal_5fe24ad2df164.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451551/normal_5fe34fb38b884.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452154/normal_5fec239c1b5a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426269/normal_5fd915165e00f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380674/normal_60054477a4dba.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/c094238ee.pdfIn PDF document text
    • https://kevanosum.weebly.com/uploads/1/3/0/9/130968994/8f1efe7d.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/a501a289-1251-4093-a981-334431926e6d/jesubitiribag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dda12d12-9c0f-4ed4-9917-58628886c6fc/zero_belly_smoothies_free_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b69a744c-6b8f-494d-9481-07acb75e0063/imperialism_in_heart_of_darkness_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2149653-d68f-462c-b52b-3075747daf25/roresulekobujunororop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a3ab654-96ec-4a38-9057-1a26cd84905e/83321604619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d344ba4-0d34-4b1b-8bfa-9d4d72247d78/fubigezafuripexalejenusu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 5152 bytes
SHA-256: 8ce3cdb64f80e4b4da862b16127a3e75942ab9e672b0ad04bf8ee1e861d10dd4
font_01_sfnt_off0000fa20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA20 10880 bytes
SHA-256: d0bdd253712186c806c583601f48a098a10e6f30ace66f4d8301c5968e4c56f1

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