Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca5c9ed9174115a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-21 00:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5253b826244543c52d2dfa9ea0905b0f SHA-1: d9581bcc3805080e84192ffb2e5eb068c543751b SHA-256: 4ca5c9ed9174115afd786b080bca7647f0ae589bd9915e50a8d711152a7effde
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable hosting and acting as link farms, suggests a phishing or malware distribution scheme. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://synerhu.ru/uplcv?utm_term=tamil+movie+download+2020+isaimini+hd PDF link annotation
    • https://funbugs.ie/userfiles/file/64339878799.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/zubasufu.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/19210828730.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/86129186134.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/wimerasokivebikigixow.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/33640086992.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/46599917655.pdfIn PDF document text
    • http://standardamulet.com/files/files/rawevimaxosigozaruxub.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/98144535690.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///20724463959.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/50494010508.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/sopem.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/gibarevifa.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16142b3d7cfe77---bakuvixomepekoforepo.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/janopatibep.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453f9d46a84---11171408150.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/romezukuzapujituvagum.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/6209824814.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/15582249738.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/wofumajolusisotaxes.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/zafesapumop.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/mobojukukiboguw.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/naxiwabidikugomexaju.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_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 17256 bytes
SHA-256: 8b167ed8959d6ff093f9477dbbb552f3748527d6dd50f019e6acf606602a7b5f
font_01_sfnt_off0001127a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 10672 bytes
SHA-256: a7c25cbc6f60e13c99b752ede14b0399547b4ddc693e767124d4d6b1adbc8d44
font_02_sfnt_off00012ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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