Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef0f50ef95c7bfd…

MALICIOUS

PDF

72.5 KB Created: 2021-10-12 04:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 009a83d43a92f615d8bfe552b3488911 SHA-1: e6a170e29e7ca0332b9525113a4ceab789901943 SHA-256: 4ef0f50ef95c7bfde0a81269c7a4253a8d67b7f0d4bfe879fe439b7f0e34b98f
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, containing numerous embedded URLs pointing to various domains, likely to obscure the final malicious destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a pattern of using disposable hosting for a large number of links, a common tactic in malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://congnghiepxd204.vn/upload/files/69687097394.pdf In PDF document text
    • https://villanakarin.com/userfiles/files/lofemufujikejusisegana.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/digiduvejufevapefimopa.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/vejikarabipugesad.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210904145139.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72254465921.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/62594091328.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/mimotimula.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/wilevakowule.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/xawuximabow.pdfIn PDF document text
    • https://oriolefashion.com/ckfinder/userfiles/files/lukeg.pdfIn PDF document text
    • https://12tiga.com/contents/files/vukuririzubizikaw.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/fojej.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/70160300727.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/666ed166ddba014c024f9260b226e0c8/24062057339.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/20791914161.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/66200724298.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/81377468061.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/34650095779.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/34872552867.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614537e218f34---lobejuzefilerupip.pdfIn PDF document text
    • https://qcbusa.barettis.com/userfiles/file/sebugiwaki.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/noreke.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/digonuzigudafofosukekas.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/desetatiguwelipepa.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/1hHberoKktI/uplcv?utm_term=sapling+learning+general+chemistry+answers+pdfPDF 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_off0000baf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30D 11224 bytes
SHA-256: caa8074d4bb0dab064cce4dff02ced014d3d63c7fe1d9b79ee396d1f2756552a
font_02_sfnt_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 15212 bytes
SHA-256: 214ec191294c244272968976b5e22718c0ddfaed5deacaad7bf0d7ccc175a00e