Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa4b70694d83086…

MALICIOUS

PDF

78.4 KB Created: 2021-10-15 05:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 72776d42abbb8b5420071164de6992c9 SHA-1: 733f66e32acf534ad84092de89118dcc460cafb7 SHA-256: 5aa4b70694d83086b45b3462308451193d931c50aea738ebc284577c442ec3f0
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous external URLs. These URLs are likely used for phishing or to distribute further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chcial.ru/uplcv?utm_term=how+to+compile+ac+file+in+linux PDF link annotation
    • https://hijaulumut.com/contents/files/94203073307.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/jopesedu.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/25532938284.pdfIn PDF document text
    • https://robertbah.si/files/file/piperunuwovovavubor.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/17973431371.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/83562369642.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/tuzuvutusekag.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/53936679609.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/liraserolisararapemeg.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/9781208248.pdfIn PDF document text
    • https://redfortfireworks.com/ckfinder/userfiles/files/vixavunexanegezu.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/nibafinojik.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16153af6077fb1---67991568864.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/moratiduvawudonewuvafawu.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/60211530062.pdfIn PDF document text
    • http://jpiano.net/userData/ebizro_board/file/duxatovamogo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/s167ihngvb124ee3k0d2gl8jqf/87001871892.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/pelerexolunofutafofenuba.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/58482281940.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/46621427158.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/55979669292.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/25071996083.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE701 17204 bytes
SHA-256: fbbd524ee277fbfb50a8cac266b27bdc088b89fd86590a78177a1da4f03f308b
font_02_sfnt_off0001141a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141A 10652 bytes
SHA-256: 8b40fd704ca1fc8735a449321c5064d6d3020c5096f873ee8c27d6ada131264a

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