Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0bf60f36915c6e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-14 02:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 69a0e1879d6300c55aaea6543701735a SHA-1: 0d5142f8985ddbece5152273015f72691b4f8d8e SHA-256: db0bf60f36915c6eaea5a2c2fbf5a3584639b0f511507c3b835e1a26812836aa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF also acts as a link farm, directing users to numerous other PDF files hosted on various domains, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://thaihotelsale.com/FileData/ckfinder/files/20210906_D1B5F4260B6BE498.pdf In PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/vefigaxixukugeviriva.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/76216958387.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/nipejafab.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/8268680485.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/94533404515.pdfIn PDF document text
    • https://hirurgija.me/files/rodigijufokowow.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/xitowuxiwasikulelezisi.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/90041990596.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/borofixu.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/buxez.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/73109172554.pdfIn PDF document text
    • https://33mobility.net/uploads/files/77614404978.pdfIn PDF document text
    • https://htchninc.com/d/files/57592619154.pdfIn PDF document text
    • http://theponghop.com/upload/files/4868462049.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bd0cd073f---gisulafizudosebusedo.pdfIn PDF document text
    • http://clerus.hu/files/file/xedokolodubuzegufaku.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/vivegizugekugilubominewa.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/redoloduxovan.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///12212282045.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d78f2db84---35738331535.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/62362855393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=episode+offline+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_off0000b78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA0 15548 bytes
SHA-256: 6b25695ab222a43e89b337c554fa7c432bfdecf81aa3d5e5f47c3f8a8125f877
font_02_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 10368 bytes
SHA-256: daaded6b2028abeaff2ce2ea980d8161017ad951bbc7fed19dfad553086678fd

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