Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c2b1c4668f23687…

MALICIOUS

PDF

100.6 KB Created: 2021-09-09 23:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b400ca1972513aa15ccc990fba08e5b4 SHA-1: 81ceba5dadceb53b969d8afcd18962819317b64d SHA-256: 9c2b1c4668f23687e942d7a14ac661c26c0c3e9fa9a599b0cbed2e8e658287fb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to potentially malicious websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests a phishing or malware distribution scheme. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://probidjp.com/ckfinder/userfiles/files/20210907_165800.pdf In PDF document text
    • https://5ky13lu3-1251.com/contents/files/likize.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/xarigibifa.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/13951750281.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/pilimidod.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134675c3ee27---rozezuxupabag.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/kijopinowagadidojubuk.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/rabiketaf.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/bavagenoboloxeboja.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/52940078373.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i05v1av5cs7vmht084udmrttk5/karobazefudusovedulewagup.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///64685858179.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/popijobimanu.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/57078518256.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/32776541168.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/72082995930.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/lurupuzolilagufuxud.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/togadabusatasitan.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/nawuvadubaloniteb.pdfIn PDF document text
    • http://lg-palette.com/upload/files/kogobojewufura.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/wovufepato.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/26025458936.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/giwesimatudekerigok.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210905130242.pdfIn PDF document text
    • http://ranchobg.com/img/file/90168706625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=asphalt+8+multiplayer+with+friendsPDF 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_off0001226d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7F 18696 bytes
SHA-256: aea0e76eeacd978706d9aee6698ee8bec17ce10ab639af45f710e2d412181479
font_02_sfnt_off00016aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AEE 11132 bytes
SHA-256: 4d6296317f8d15e0e15ebb537bdec46183013c0bc0fdf03e0282eabc642c6bfe