Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddcbb66413879204…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 10:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 42f17501c756a39bb28135b66bcbdf3c SHA-1: 46d7170e144a441378d5be223607b63e8c100836 SHA-256: ddcbb66413879204adb3e128a9fe7b98bb65c40b20d4693e5e5157627ad714da
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers as malicious. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://cyc.cz/pictures/clanky/files/56385339027.pdf In PDF document text
    • http://salon-urody-bellis.pl/images/file/rurososebodutapitubemi.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/89966969006.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/72230683808.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/46877704643.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/zasubawuxinokebebiminitet.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/68900137369.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/77388768219.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/78104848327.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/futati.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/gidufo.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/tetujuwejiz.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/powasefoxovafanu.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/buvarinutebe.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/v3qua3dj8d9d0llc6r9v1jf1ob/kesoxo.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/1894998109.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/detula.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/51108532600.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/66641552902.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/34831565866.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/bijajozovak.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53b44bfe2---kikaremotojudopum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=rooted+emulator+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_off0000dae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 10492 bytes
SHA-256: 0a7e1c98d01d21b1b9e19e964e6609ad7519a51c90c58f4083ca233c732e9a35
font_01_sfnt_off0000f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC8 18616 bytes
SHA-256: 63c79a470a8668af321a32827913c25ff67be45d62aec60db87046044d9d1fa0