Malicious PDF — malware analysis report

Static analysis result for SHA-256 9101c29833916046…

MALICIOUS

PDF

78.0 KB Created: 2020-12-30 08:13:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ac230938d97be0f4ca2a93403500fedc SHA-1: 15dda57a8612a86f54de4be69aa9e168f488a8e0 SHA-256: 9101c29833916046aa6dc57cc2cd83d643fab7c6358e96a09ebe42bf698b5de2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. One prominent URL, 'https://trafffe.ru/123?utm_term=don%2527t+stop+believing+lyrics+journey', is presented in a way that mimics search results, likely to trick users into clicking. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

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://trafffe.ru/123?utm_term=don%2527t+stop+believing+lyrics+journey PDF link annotation
    • https://cdn.sqhk.co/zenetofuma/FRhh7gj/delicious_silly_sandwich_master_rindge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5fcb39662e218.pdfIn PDF document text
    • https://cdn.sqhk.co/dakubakasilu/jijdGji/75348399216.pdfIn PDF document text
    • https://tugigoboz.weebly.com/uploads/1/3/4/4/134499705/ac9a942f3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372723/normal_5feb7c33cda31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_5fa243d640fb0.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/zerepuzuze/basejaletotuwagubisesevak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bdacd49-9227-4a1a-a3cd-7da96dbbce7d/70735413623.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/bintray_android_gradle.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/78698885047.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/r2_zoning_means.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/61146652732.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_off0000cebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBC 5184 bytes
SHA-256: a809d01d1b445df146e501463ce110cb92496d3c19caced58ae656dbc1709f16
font_01_sfnt_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 12372 bytes
SHA-256: 02b3b4f8b1fae48a98646eb51f68fcafc63d7254e5886d0626427fdcd79eb50c
font_02_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 16124 bytes
SHA-256: 6e5f14b44ca3a668bd75165f7ca818f89c0bc95466b08ef3d44a4bd45a3d7e47
font_03_sfnt_off00011cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB7 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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