Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14317b3b6f2b5a7…

MALICIOUS

PDF

67.8 KB Created: 2021-09-25 21:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f89e8af7df2adcf437dbb18875a01986 SHA-1: 275bece3ff35a70ae23f30b0217db58af0b7a71d SHA-256: f14317b3b6f2b5a7e3e5604f2568c35b05f932bb2586488b79b4684f75070f22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host multiple links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. While no scripts were directly extracted, the presence of numerous embedded URLs points towards an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • 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.
  • 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://imbirimbir.ru/files/vefuta.pdf In PDF document text
    • https://autonoleggioassereto.com/file/39250653098.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/4535023092.pdfIn PDF document text
    • http://runhouchem.com/upload/files/dunawixupe.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/58333652953.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/39580851844.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b7c9e75b1c154dd056b98302d36d728a/dukil.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/kuvovum.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/dewewo.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/vopazifewaj.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/lokavelomilokoxegaji.pdfIn PDF document text
    • http://esipro.be/userfiles/file/63364227166.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/gisoduzotunini.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/zigulagobir.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/96532853752.pdfIn PDF document text
    • http://digifast.cz/userfiles/87493298558.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/xazifalimevakaxajo.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/65789526250.pdfIn PDF document text
    • https://linker.tw/files/5026907168.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/97456436446.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/5769330035.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/39590196730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=paid+apps+apkPDF 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_off0000aca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACA1 9876 bytes
SHA-256: 0d1823adfca002e0b77143b1d88a7cac654429d256a19d5710183468d2e393b3
font_01_sfnt_off0000c274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 15664 bytes
SHA-256: ac7672f0baa1e88d569dc47458bc837c8df93d109e6334891fd2478ccd405de2

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