Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d599ba15470b93…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 11:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fcdd2fcdc1a704648750b76c715ab50c SHA-1: 2c02c65bc147480847a645d7d6991f3a27b1a988 SHA-256: b9d599ba15470b93c866366d42268d4cf6771da470f8f94ef91693be5d030678
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to other PDF files, suggesting a link farm designed to obscure malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=droidvpn+premium+apk PDF link annotation
    • https://nieruchomosciturystyczne.eu/files/file/51627695714.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/xiwasej.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/96224118545.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/33747469257.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/64564225276.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/mimonipadid.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/sikivaviziguvumokofi.pdfIn PDF document text
    • http://hidramaco.com/files/files/zerejubenejiwedizoweruta.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/gukigowos.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/dedewuwad.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/nusiguror.pdfIn PDF document text
    • http://jump360.co/upload/files/20210904075031.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613259f2c1880---39735439689.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/pekusineminuz.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/larozuwovorojafo.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/kakes.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/vujizawasasisibis.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/foladesewetedowixij.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/4453850903.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/wuwosanilarolejikodobo.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/30576018293.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_off0000d5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 10500 bytes
SHA-256: 90a85a2cd8093cd2928cc520d51e1877ca11861f7c4821328f38c44a60ef1b4a
font_01_sfnt_off0000ed95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED95 17552 bytes
SHA-256: d9ce647e8a39836f73b947ed6d3ab540b893b9862ff26be601b58ef43e9d7f65
font_02_sfnt_off00011b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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