Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c696f49b966f4b…

MALICIOUS

PDF

80.1 KB Created: 2021-10-05 15:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4809538a0db00f4b80cb6f763bfe774f SHA-1: 5c9290e29c4ae3da8d69124f1ccdd88a871e08e3 SHA-256: a3c696f49b966f4bdc45ba242ccfa5165a067a27f9d9df2efb67c82071d678a3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ain.proximeo.com/ckfinder/userfiles/files/27913527672.pdf In PDF document text
    • http://www.europesolidaire.eu/userfiles/files/81386559128.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/10739292194.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ebb47e686fee23716f88dc8cb9f5938c/muzaguvagunasiwigav.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/74436632766.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210906144945477896.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/74424439685.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/jukaziwetowej.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/98713303775.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f1b1450c5---63024989713.pdfIn PDF document text
    • https://mayxaydungdailong.com/media/ftp/file/dejisasarupuwotebuxeze.pdfIn PDF document text
    • https://bunianco.com/other_files/File/40811355211.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/kowekif.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/86338128411.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/kefijobuvul.pdfIn PDF document text
    • http://kodemari.info/data/files/refife.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/fenufavawitod.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/sasezu.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/43671830113.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/22223606481.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/putirulalewo.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/24754357013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sani+in+6th+housePDF 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_off0000da3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3A 16356 bytes
SHA-256: 24cc13621940d653c9b7c51af1e5772d79c153f44f3a8b37dfb60c2174aa1df8
font_01_sfnt_off00010393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAA 10400 bytes
SHA-256: 66a21661283440138e1df53136cde8d893b2854ee07830079a284d16af1bb12e

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