Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c930f0d91996ab…

MALICIOUS

PDF

82.3 KB Created: 2021-01-22 12:01:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 73c7dda34ad0cffdc578aae2a773b968 SHA-1: 7712d567bd5da5fddb648441646b828262c258ac SHA-256: 24c930f0d91996ab1896fadf268e4ddeee96b246f2ccc4394555aa9140e484d6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL leading to a suspicious domain ('traffset.ru') and flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site.

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 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://traffset.ru/123?utm_term=proving+right+triangles+congruent+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369183/normal_5fe3a89a7c574.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383573/normal_5fe4b7b55a5b8.pdfIn PDF document text
    • https://bowepatajipama.weebly.com/uploads/1/3/1/4/131438296/vegebapubonaw-jikuj-mirebu.pdfIn PDF document text
    • https://site-1177603.mozfiles.com/files/1177603/pivot_lightsaber.pdfIn PDF document text
    • https://xawupaxov.weebly.com/uploads/1/3/4/6/134699297/peneramowapu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_5fdbccf4b3b16.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/036596042be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413966/normal_5fdabbd5337a8.pdfIn PDF document text
    • https://luruxelu.weebly.com/uploads/1/3/2/6/132682974/2945395.pdfIn PDF document text
    • https://site-1176340.mozfiles.com/files/1176340/91273678809.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485695/normal_5ffe58515dbff.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/vonuxagupeduze/kiwib.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/handel_messiah_hallelujah_chorus_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/56919735463.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_off0000da9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9F 5516 bytes
SHA-256: 5cc2d7cf86f491a3f64d6977f290f03bb96de8f60f776ddeeeb22d7e5fdefe69
font_01_sfnt_off0000ed66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED66 12704 bytes
SHA-256: 6508c9f95a83a845cd0660647366a2f7d8d88b15c752922f1027bfb7df8802d4
font_02_sfnt_off000117c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C7 16212 bytes
SHA-256: 80834fed5d78b6a112bda3470fc269c854d28a4a9f87e15f39d06ee5455ccd81
font_03_sfnt_off00012d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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