Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f93fd1d7b0ee250…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 06:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cec24144dc356d3ad6212d64a188b5dc SHA-1: e269c8b5d9a5fdd76afe0d24650235dbcc34bc4b SHA-256: 5f93fd1d7b0ee250fd273443cd34a3c4b9a7750929cf148f9ded0be99525f563
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and heuristics point towards a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://moscowfashion.net/content/xuploadimages/file/pujubus.pdf In PDF document text
    • http://termosystem.pl/userfiles/file/vijizatid.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/98165975605.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/papegujinepatifokuzo.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36521335844.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/difekumofakotatus.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/wupiwuxowebanededobepase.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/rupuranesotax.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396c9540fbc---fisad.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/najizezaxilo.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/badigovumiwuk.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/xagewuzejakidadeji.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/patisusafutoko.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/98786126447.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/sizimexa.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/zibesuxasisesubanike.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210908/file/44967919556.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/45088112429.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/97126393211.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/75087510864.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/48135668152.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/39324314786.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd24de25e---21043532894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=industrial+revolution+flying+shuttlePDF 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_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 10864 bytes
SHA-256: 3bca6718a0b309b6ab297d6c3008cab7799a10419c9fc7d2b53b29d6b134fda7
font_02_sfnt_off000110e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E4 16984 bytes
SHA-256: 3892afa76f4ed47c398998fa7e8afde0f740ff7810440a2e26677c43ebfe8545

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