Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0c76f8570becc0…

MALICIOUS

PDF

69.6 KB Created: 2021-09-16 19:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3f4b40cdd9cf664c20caf48715c2d0da SHA-1: 1b591a638fcd5810f17359db469f30117c9f630b SHA-256: 1a0c76f8570becc086a15cda15f4679db1466d1b6e0a6bd9b73f2f5c8b6dc569
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to domains associated with link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to redirect users to malicious sites, potentially for phishing or further malware delivery. The embedded JavaScript, while not explicitly detailed, is a common vector for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://ratco-hardware.com/Ups/files/furalujaremuratijimo.pdf In PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/10797688641.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137913876636---nitomenowazitemaxalen.pdfIn PDF document text
    • https://securitydm.com/slicice/file/31355776479.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/xotoxavekoninumikubofibo.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14992293307.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/jefebavisoziba.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210909_07E34F311D164DDB.pdfIn PDF document text
    • http://deforma.it/userfiles/files/61900274681.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/16305979291.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210902162737693.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/26784266809.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/90010224360.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/lidozerasapibos.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09671d99f---xinivoruwof.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/nutaxi.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/kagavo.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/75949477457.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/betirutuzuwipubako.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/lesawigoselijapibepafala.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/kategaguki.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/degurafibekubafigode.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/28813555761.pdfIn PDF document text
    • http://learningkey.org/userfiles/72130266742.pdfIn PDF document text
    • http://markone-tools.com/upload/files/69538105907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=different+io+gamesPDF 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_off0000b2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AD 10512 bytes
SHA-256: 1f21c650bb2ce19463f1d01533460afce3cb23c763a1379b82f823829ff30b11
font_01_sfnt_off0000ca9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 15196 bytes
SHA-256: fb2e6477dc7032bc7c80a5146569021113879f5caa2391ede19be01c6872dd14