Malicious PDF — malware analysis report

Static analysis result for SHA-256 669cf0d8c44ed59b…

MALICIOUS

PDF

88.3 KB Created: 2021-09-12 16:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e305b6e59206d84385e475878702816e SHA-1: d0d0362925c70fd96dd31ea39bca205a8609f370 SHA-256: 669cf0d8c44ed59b6779a06219b378e7dd101b22b5e275951b334fec69c57b1a
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs point to numerous PDF files, suggesting a distribution or SEO manipulation scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://boilerservis.ru/uploads/files/bodasakutelaxa.pdf In PDF document text
    • https://alarrabnews.com/images/content/content/file/6719084611.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/78481450634.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/segir.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/71803100157.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/gitoxumunibosedun.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/kidulodetawuranedetives.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/39862556730.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/7773937558.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/27356696685.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8376aced079c1c71c63df890004261a2/87626059418.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/97986825552.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/sodowet.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/70823878089.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/gaxuzidut.pdfIn PDF document text
    • https://telenovella-bg.com/files/pisafafirumu.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210908222322972113546w6.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/45296039886.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/bepivuwitirosawolub.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/4eabg7n3uf8psq8hedb9htmncl/guvida.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/tubuzolisugafavon.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53240300747.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/mirujokulopilen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cara+membersihkan+file+sampah+pada+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 10928 bytes
SHA-256: a3a3fd345463a6e40788ee39af4a622a41a9c68427a910deb553b5429e798a51
font_02_sfnt_off00011120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11120 16804 bytes
SHA-256: 9528f6e9ffe4c9d8e54041cdee31a6f31191b80837716b61de55b907f024ee84
font_03_sfnt_off00013cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB7 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855