Malicious PDF — malware analysis report

Static analysis result for SHA-256 4013293b7a56de99…

MALICIOUS

PDF

84.4 KB Created: 2021-09-17 16:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac760d26ac52ea24c5d266a11e3e533a SHA-1: a464a5aed42f2c9fdd18ac2c06a11107699db57b SHA-256: 4013293b7a56de99b4b967868debde237a9b47750e87fbefd0e0fba35b7e9733
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure to trick users into downloading content. Numerous embedded URLs, many pointing to unknown or potentially suspicious domains, further support a phishing or malware distribution attempt. The file's structure and numerous links indicate it functions as a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://iphonedown.com/ckfinder/userfiles/files/kugewilunuvira.pdf
    • https://hetodon.com/fckeditorfiles/file/pezajukijet.pdf
    • https://siltri.com/fck_upload/file/28570253282.pdf
    • http://fvv-hohenfelde.de/sites/default/files/files/13869448832.pdf
    • http://livestocktool.com/d/files/lesigulomo.pdf
    • http://hondatayho.top/img-ngocbao/files/74453372122.pdf
    • http://dlzhrjd.com/images/uploadfile/files/januxekemiwunagaxab.pdf
    • http://stopguepes72.fr/userfiles/file/pakedonajenigozi.pdf
    • http://lokalsport.no/userfiles/file/81603908909.pdf
    • https://mrpressconsulting.com/UserFiles/file/87997673507.pdf
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/40372837981.pdf
    • https://xn--atpta-nfb.lv/images/userfiles/files/tovarutunuwawedeniwuzavif.pdf
    • http://brilliantsolarpaneling.com/userfiles/file/78292018632.pdf
    • https://www.terraton.com.my/ckfinder/userfiles/files/deresutebugekazoxade.pdf
    • https://hotelcorona.ro/files/tanazosoxibagosedubotopu.pdf
    • http://annassteen.com/ckfinder/userfiles/files/44804092202.pdf
    • http://quesnelfoundation.ca/userfiles/file/zozudogeputojuberuf.pdf
    • http://fortwashington.abwingsmd.com/uploads/files/5850438160.pdf
    • https://rocksoliddesigns.biz/userfiles/file/jejuraxaluziku.pdf
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/89915864140.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612faaebe39a7---24699908216.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/19f48572acad502df00879d00b35019f/tewuzirigitogatanovu.pdf
    • http://opt-russtd.ru/data_center/upload_pictures/file/24476835761.pdf
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kudotukinifexinaromis.pdf
    • http://saddabro.com/userfiles/file/kogiseromefovuxitivaka.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=god+of+war+3+download+ppsspp+iso+android
    • https://www.thc.gda.pl/ckfinder/userfiles/files/rifezunosubagela.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e508.bin
7579856527c5a9cb08cb1df93110eff5de22cca9e964b96d62c46b0ed8f00a71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 10556 bytes
font_01_sfnt_off0000fd43.bin
5bf290f9f067f5a62ff3fdcd8451598212c837a07923d8f6d099e140b49a0e3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 17708 bytes
font_02_sfnt_off00012b8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8F 16792 bytes

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