Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a15d28252dc98f…

MALICIOUS

PDF

75.1 KB Created: 2021-09-20 09:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 70cc96f2e46a3a6e43259fe8e42052ad SHA-1: d14c7b4ac3457f2616183b655ebd8c2d434c89a3 SHA-256: d4a15d28252dc98f9bae73383575d5a5aef4d58dc87c07782bb6afcd21b8a018
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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://ciaomamma.hu/editor_up/liladelun.pdf In PDF document text
    • https://conviviodihera.it/dati/upload/file/35988242652.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/99355662522.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/felawokelis.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/dofagobopawanovezurovezek.pdfIn PDF document text
    • http://seritour.com/rsm/files/palevemapegov.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/13594314109.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e32a3adf97---19376274277.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/xanujafosotanupegamet.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/9376425081.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/j4udgulns1pecdh5kjuoc4e0aa/53198820902.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/mowexunakubokijorosite.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/64500482503.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/pivipafax.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/44904520578.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/tefomoligefasapofe.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/72240342221.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/lidekazenopesisebupuliluj.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/30779235318.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/94834067597.pdfIn PDF document text
    • https://vitanov.rs/files/kuvinakifaruz.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/12414399679.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/5770510707.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/4392243671.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/26528172026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=clash+of+clans+android+1PDF 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_off0000c6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BE 15980 bytes
SHA-256: 3f6bc6d9af612ae10bf95801631cf3d4333245884a355c2eed73359cacd41711
font_01_sfnt_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 10424 bytes
SHA-256: 8192162625fa678a77c31619da78c9bb60bc6a0afc3839f67c2da6064889e975