Malicious PDF — malware analysis report

Static analysis result for SHA-256 494f9390b7d75dfd…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 01:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 950332608cb9b3308b95356a1c480465 SHA-1: 7eed488f214fa06977219345356412d633f16a78 SHA-256: 494f9390b7d75dfd8cc379c3f4320566ae70dd6cc52fc0ab81a8bd032b8f3b71
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to external URLs, as suggested by the PDF_URI and EMBEDDED_URL heuristics, which are part of a link farm designed to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bcslaw.hu/admin/fck_upload/file/sokar.pdf In PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/sitajijenogosodusefo.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/bomokavosatotewora.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/55128779182.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/69854966071.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/xumetoxuwijumaxu.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///93689237349.pdfIn PDF document text
    • http://pedraferro.com/files/files/99560995435.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/komurapiporijamagenujuva.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/16208025445.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/fa66e17eda3ad6cd980944bbb3c10748.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210901122431_5a57i2.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/41492201795.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-2/20210902190823768464.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/gepuxekurizuwakogus.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a04c2beb34---vimituwakojelibarijosebok.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/53599764223.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/biparimofekutefopizu.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/10769094496.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/dazasizopir.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/e3d2555d19146fe52b3506c1e7064377/47577467630.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/81540333231.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/38133252425.pdfIn PDF document text
    • http://nprofit.hk/userfiles/45581409334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dbz+ttt+download+ppssppPDF 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_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 10348 bytes
SHA-256: 0789dc3149f6b31f2dabdee6fe142d6453561b578a6f4a571e79f28802e01a84
font_01_sfnt_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D7 17944 bytes
SHA-256: 624de7e79f2eb25e211782c1c469e900e315882712349ba4b625fce040a5b180