Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cce336464272fb5…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 07:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 029db49a3d6899b36283b9deef019a14 SHA-1: 926fc4cb883755148a59f812f12a04ff5d85b2d5 SHA-256: 5cce336464272fb55c995b6a209f8e3a6e5d51ae5e60444d1f3f2dc2b7e8a026
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or redirection scheme. The PDF structure and embedded URLs point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=webview+app+example PDF link annotation
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132727854870---puvobomip.pdfIn PDF document text
    • http://dongphat.net/upload/files/mekanekuveka.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/79467913154.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/50975801531.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210904_132E9B227FE4D95E.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/dakowixifisoxelapata.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/wusiduwebolifovan.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/17b205d5489bb58361297da7f9f6c79e/fujimogerapemoxubatero.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/3500347348.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210908212755_8uf3dx.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/laxijedupupebupirimuzolez.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/77648116537.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/jejuj.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210909003725.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/86484398713.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/62497841890.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210905051706240997nyyft.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/88028783006.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/88606469566.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/42980616047.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/77985169033.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/45756331239.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/muwanifuwub.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/jezobip.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210904_E69BAB9024C19EBD.pdfIn PDF document text
    • 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_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 18772 bytes
SHA-256: 66d8b9e29a20b8b874855b3107ca93149aed4474172b30d8a1768a45edc6581e
font_01_sfnt_off00011617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2E 10208 bytes
SHA-256: 979e39a5c91e7ee893617e69d583e17241bb3031fcd52dec1642d69258e01174