Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03093c551fd7236…

MALICIOUS

PDF

69.9 KB Created: 2021-10-08 02:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a211df0f6771b65adc69b35248792897 SHA-1: f24f6abbf6cd88b4a6a392ee9d8d92c3923c471c SHA-256: a03093c551fd723634ac964ee1508b3e58fe9ccd9752ad2a3184fe940d26c28c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable domains, which is a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving a malicious payload. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://usarsenal.it/userfiles/files/jitarixigolozebafa.pdf In PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/60367371244.pdfIn PDF document text
    • https://olterus.net/contents/files/bokegake.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/suvutijaxakovasebujan.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/57994095240.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/pupos.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/jizeganekuvubidugoji.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/70237905711.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/sogigegotovovitux.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/tosigi.pdfIn PDF document text
    • http://sayarbobinaj.com/file/96029358061.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/zugefoxubo.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/63988782792.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/61394590872.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156228b12faa---67356373475.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/19478047896.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/lofewojexibotixiteput.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/55430228739.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/35677500462.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3aa6c6816f050c76f780e50e8e65be1e/dutizojugugeworogukupuvom.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/muziweweregenemu.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/46943601664.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/30911011540.pdfIn PDF document text
    • http://thepducphat.com/upload/files/69681541744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=14000+sq+ft+in+acresPDF 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_off0000b24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA62 10464 bytes
SHA-256: 02c5a6857e2b7dc0ed034d9e2d326dc2093fdd98df62a9da2c75e56ef9ff8928
font_02_sfnt_off0000e252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE252 15684 bytes
SHA-256: 048ad8c641f44efb67169a6f2c068e5cbe42e9bf63ba9e3649a1aaf035896fec