Malicious PDF — malware analysis report

Static analysis result for SHA-256 df429ffc6cc053e8…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 13:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c631385267f3523041607d0029a84c51 SHA-1: d0e2402661240b5e313bdb972a7c618befa4ccb0 SHA-256: df429ffc6cc053e812c98c92725a6b39d9e59c574d8adc1b0af3dfb2859234ff
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of links pointing to disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://copacndg.com/images/uploads/files/37431766932.pdf In PDF document text
    • https://advantagelic.com/singhania/downloads/file/titigigiwazabajorifepikup.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/9768602680.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-13/20210913183037337519.pdfIn PDF document text
    • http://otczenacts.com/media/files/41985258375.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/regetaloxugurewujonawura.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161357d02a8aee---laziravoduxor.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/38286248786.pdfIn PDF document text
    • http://ippon.lv/uploads/File/letilekixopakogokevuxudi.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/bolukudabemowezemozoxibun.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/25938192635.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/99093061723.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuxakawer.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/78578011330.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/pikozegafifozodap.pdfIn PDF document text
    • http://balalajka.nu/media/sutiwadubexavalokogalo.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/kuriromabedevitix.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/bokilulemevujufuje.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed30e6e7af---3321999327.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/93021027820.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/78695064728.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/wuzuvijeweporuwawe.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/728857010.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/12855473468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=microeconomics+theory+and+applications+with+calculus+5th+edition+pdfPDF 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_off0000d056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD056 18432 bytes
SHA-256: d01dd5bc231fbc6785a65776f3ef25155d45d82c184b0ff46311f6dda906a6d7
font_01_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D7 11312 bytes
SHA-256: 8fc78c6c5f34db2152ca00a2abd2fb34d0357eff2a44b8fd2edae4b611c67741