Malicious PDF — malware analysis report

Static analysis result for SHA-256 b757af253b535ee0…

MALICIOUS

PDF

66.7 KB Created: 2020-12-06 15:34:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8dc759cf98739ef9edcc51e70785b916 SHA-1: 947f7d1729576e585ed142552509547c7ae50cc6 SHA-256: b757af253b535ee03d6b98ce94973d67f95a3c3936f668ebcdd85a06985f26e3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffnew.ru/123?utm_term=sport+psychology+concepts+and+applications+free+pdf PDF link annotation
    • https://tudexabi.weebly.com/uploads/1/3/4/7/134770635/9fad05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489409/normal_5fcc04b926301.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_5f96b98c29081.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/a9eb11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530457/normal_5fb94ce9c1b29.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/xixotave-nefigiwomejulig-vekovijaf-xavevamoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5f9a51d54ba35.pdfIn PDF document text
    • https://lelobetiladafan.weebly.com/uploads/1/3/4/4/134497055/fofutenirazunet.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/84818569-3d39-4111-90c5-6cf5b7de36e4/tijazatopapilipilove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c7c2ec-e819-4feb-bbfa-accece668d8a/student_centered_teaching_strategies.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/yesterday_weather_report_in_tamilnadu.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/fifty_shades_of_grey_trilogy_order.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_off0000c631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC631 5620 bytes
SHA-256: fbdd285adec89f0ab7a2fa5e674ad61976fe34585f4bba614a0882b5644343d9
font_01_sfnt_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 10772 bytes
SHA-256: 8552c6d95626bbbb253cc2e4e7a9e79ea59650da9d13b701469b36d3787c6c73

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