Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd59108b167c963…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 11:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 716a4b562316e8539265e299cc0cef0a SHA-1: 68c8d097a1b7911ef85574a0b1bb1f74697e29e1 SHA-256: 2dd59108b167c96398eab21fa180bc8d55d3c65c2e7a7e8a67f6fc9225207d7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis identified it as a link farm with numerous external URIs pointing to various domains, many of which are unknown or suspicious. The presence of a URL related to 'pubg mobile cheat codes' suggests a lure to attract users to click on these links, which could lead to phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dazhonghua1688.com/ckfinder/userfiles/files/texifipesotasajanebiz.pdf In PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/jipapigonekadeso.pdfIn PDF document text
    • https://bunianco.com/other_files/File/99932631074.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140000edfd73---67584246987.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/mezafebusupojazojawiwo.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/vosuwebojeribosotipeleko.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/koxaded.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/36176560157.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/95711719218.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/guvozokonuvu.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/mazugemipagowijef.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/nuvasigibenufuxoxa.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/26747874562.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/19720240547.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/69985549733.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/zoterolofulo.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/rititovexagubobaba.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/90816438912.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/timopudesezir.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/41301861838.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/gozarunuwodukibo.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/43739208155.pdfIn PDF document text
    • http://rayer.cn/d/files/sumarurezozafobabazoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pubg+mobile+cheat+codes+for+androidPDF 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_off0000c30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30B 16660 bytes
SHA-256: 928ec9cc41e2639354109a5cf41e8e25e30b7767be35d53ea2509a7eee6c7cdb
font_01_sfnt_off0000ee01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE01 11164 bytes
SHA-256: 3523b088bdb0b56fdcc962f7ddc24e2203a5c45891de86a7e91495cd8596b7a5
font_02_sfnt_off000107b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1