Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e766e3249bca4b7…

MALICIOUS

PDF

71.0 KB Created: 2020-11-17 03:35:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b559590a32e9fe46cfc244b98ebda3f9 SHA-1: 28ac2101c7050ff55e52228ec1f63c1edfbd940c SHA-256: 3e766e3249bca4b797f9a9e0cff63fd6b094d5b43c630f892a9c9c1840dbb848
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to Weebly and other hosting services, indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/strik?utm_term=mi+media+naranja+es+toronja+pdf PDF link annotation
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/16bff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453560/normal_5fa20e909cc70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_5fa5b34a27211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f8d4c3db1479.pdfIn PDF document text
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/rikapugulepopaso.pdfIn PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/duvijodetan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471092/normal_5fa7ab81f0c15.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/joterige/paul_samwell_smith_now.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/kezofux.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/mens_bomber_jacket_with_fur_collar_cheap.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/napusadedavusaruguzunu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49D 5024 bytes
SHA-256: 437671c00ab8b011c01c0bd619ca252daffb9fe0566d0637c85070280395411c
font_01_sfnt_off0000c59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59C 11148 bytes
SHA-256: 467523cd40240ebc4fa2c54321d8394a0717cda00d8f9801c1ba27550f9f0c3e
font_02_sfnt_off0000ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 16284 bytes
SHA-256: 7603e3e57e6b1a92f5b3ca7a4d7066c4311a705263172e05f9cf7f27925f2f43
font_03_sfnt_off0000ff4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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