Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec6f85cfb0db339…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 19:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5adb77531cd2b968bb21745e0d8c191b SHA-1: 8423b9383f30f911bcf03796ca1a46143c781e4e SHA-256: fec6f85cfb0db339fd70e72a90a7049afc161d71c9e350a82c429250ea94d7b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wastran.ru/uplcv?utm_term=mobile+legend+hacked PDF link annotation
    • https://silatur.com/js/ckfinder/userfiles/files/dozemalilusupinijo.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/69393414206.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/ponemiditufunewetuxup.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/99302268332.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/jixuwerege.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/90454435382.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/59604531283.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/38897332510.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210921002527.pdfIn PDF document text
    • http://inphilong.com/upload/files/gejonuwuxufemulijiteboxu.pdfIn PDF document text
    • https://sardiniagreencoast.com/userfiles/file/57453413905.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210909125909.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/61973323571.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/64605379679.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/84330344240.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/87666800777.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/sojedu.pdfIn PDF document text
    • http://standdominica.org/files/files/89851043881.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/tujiju.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e3ca4d7cc3d431a96d54a93556acf09f/pebepode.pdfIn PDF document text
    • https://vonia.mikludava.lt/images/files/11902129180.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/79628178741.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_off0000ac99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AB 16864 bytes
SHA-256: abc33cb419806f8957a0ee856c10bcaabd5abb3bae5589fea206ae4b60c536dd
font_02_sfnt_off0000eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 10508 bytes
SHA-256: 593287c323312130ecae7bc6109750882039216561bac9e0d66e7740368f3c23

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