Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6600cb228e598ff…

MALICIOUS

PDF

81.7 KB Created: 2021-09-14 04:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6df41a3235821a0dca82d63526f5e6c9 SHA-1: ac46d8259d1a889d4490d05ba3e80ab777503941 SHA-256: d6600cb228e598ff8b85e9aafc5db8cf2bb7ab05152e5d5cb344540c64f46ca0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous distinct PDF files on disposable domains. The embedded URLs, while some are marked benign, point towards a campaign designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://antichigelsi.it/userfiles/files/45981359030.pdf In PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/sibiwidikix.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-5/20210905044939615542.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/vumolinuleti.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/97039532289.pdfIn PDF document text
    • https://produse-zilan.ro/files/79948684125.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/99893101692.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41034968417.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109101929107464.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/xonap.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/14811979459.pdfIn PDF document text
    • http://wohntraumgmbh.at/99707158555.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/rikuzuxidonezutelago.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/kepuxizo.pdfIn PDF document text
    • https://cityface.cz/res/file/gitek.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/41780297811.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/tiregosijujenodumowa.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21f5dadff---jepijozarowekopigilukarul.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/88453351894.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/49277974867.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/4652477973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=words+that+start+with+laPDF 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_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 17416 bytes
SHA-256: 4d0f4930f6f5a8ae05190aff91034acdf340ce617af0ab64b385b01d4374063b
font_01_sfnt_off00010a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12278 10188 bytes
SHA-256: 064d89d5d2683630713f3e14396228bdf7da4b5882f84d01c4938028273f33ef

Open this report in the interactive analyzer, or submit your own file for analysis.