Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe65a311760dd958…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 11:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9eb3daa0f119a58fabe507f4fb307b7 SHA-1: fb1cf6b4fc5eefc9c849f839828f1a26afbca3dc SHA-256: fe65a311760dd958d257acdb6a36f7de0b4be50d8468d534e9e542df6297da42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://sxsasa.org/images_fck/file/1631457881.pdf In PDF document text
    • http://csc-0898.com/userfiles/file/20210916000256_vutkae.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631520771.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/pezapoxosajiwowirikelo.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/sijavujeje.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/girewarub.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9fd078b96---61388527049.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/ramajokoxenupunogubupef.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/xatufilo.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/29853860565.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/rajexineboxij.pdfIn PDF document text
    • http://hjhchem.com/upload/files/64864774320.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/50049665824.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/xakutunatav.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/20246690470.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/jetutisopafasamu.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/43267807011.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/12523638751.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/bunetuxumurakijev.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/3458ea705fd00e85c89e80af558a2a87/texapotifunowoxezus.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/63720315409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gta+san+andreas+trainer+apkPDF link annotation
    • 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_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 17344 bytes
SHA-256: fee2dc6ff6ebcd7360510f8051a92f04689f5bc1e3bb729e775bc10790cf3316
font_01_sfnt_off0001063f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E56 10348 bytes
SHA-256: d630246b50a792a2060a1d98c339fa5524b44e8b057992b7f87da0c9a5a2e55d

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