Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6c63c61fc84774…

MALICIOUS

PDF

76.2 KB Created: 2021-10-07 10:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 04f0abad8ce06aa85dff0d10a3ce57e3 SHA-1: 4331617d1f9c89aa8dc80e20c0f9218c1286017c SHA-256: ca6c63c61fc84774f35ef42f7a7e1abb46eeadd7d38b887afd01241f2b8d4ade
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting an attempt to distribute malicious content or phish for information. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cructi.ru/uplcv?utm_term=weather+for+tomorrow+in+montgomery+alabama PDF link annotation
    • http://clingac.es/d/files/8606955111.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210909001837.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/82150397873.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dab1dbf34a---98957383289.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/21481911100.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/fudinenopesa.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/22155164220.pdfIn PDF document text
    • http://gamulchi.org/userfiles/file/wukulibepuzovudaxubiti.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/59731029366.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/57498832214.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/24665707499.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/koxudarug.pdfIn PDF document text
    • https://themalc.org/files/file/waminuj.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/20816176793.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/aa67ceb6a09953a1851fe99639261545/zirizupufomisobup.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/xirusoxadutenap.pdfIn PDF document text
    • http://888chji.com/userfiles/files/37776365221.pdfIn PDF document text
    • https://0900107678.com/upload/file/70127386871.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_off0000c695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC695 16984 bytes
SHA-256: 122ca4148e9e62e42d08cea050a0584f07636e1d7278ef0fb8f46ca8407ecb7d
font_01_sfnt_off0000f278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 10828 bytes
SHA-256: e785aec7e5457307e02759b70481272e399dc138ebb8fa4e671a2375dccfd148
font_02_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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