Malicious PDF — malware analysis report

Static analysis result for SHA-256 80892f1436c880c2…

MALICIOUS

PDF

69.6 KB Created: 2021-09-20 22:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1268f2f0b91d04f5b5ac058f95980d7f SHA-1: 1cf4efee982f73f27f7e27f8c63344efff749cc9 SHA-256: 80892f1436c880c2feb97f925ff49a1caba99b43a330eac4b4c8f310418248e4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=german+words+that+start+with+c PDF link annotation
    • http://benrassam.com/uploads/files/4057115038.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/421916607.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/wovigifiralulowobi.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/wovofererujomijawebebo.pdfIn PDF document text
    • http://plise.org/userfiles/file/55660191726.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/posufonesusepiv.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/bavatisizozovokuluviti.pdfIn PDF document text
    • https://www.renouer-auxerre.com/ckfinder/userfiles/files/50951365333.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/bibopogiwisume.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/3756344865.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/gakekaripetovi.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/sanobo.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/fijakapibugelekuken.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/zosozaguxesobedasevijono.pdfIn PDF document text
    • http://abc-tel.ru/data/File/20885165101.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/jixanaduxuburazoxakapo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402f640856f---gajeb.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146701aa83d7---nivanojipuwimumalosaka.pdfIn PDF document text
    • http://healthywithhart.com/res/file/karudedi.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/17292832492.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/woroverudaborap.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210913035813.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/55813205690.pdfIn PDF document text
    • https://highrise.pl/file/luturujekulerobimakuwak.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_off0000b301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB301 10716 bytes
SHA-256: e5995511a1a3d69725121e34e7653d3dfd7ea37b10c71a0a0537fbb4cb28d304
font_01_sfnt_off0000cb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 14852 bytes
SHA-256: d7dc5d473db34725035f3817da4820d7dcc57be3ff28dd69426e0a3b73b9dffc

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