Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcb24704ade4f68…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 19:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76ed369afd1775b02c7b4694bf9bea90 SHA-1: d56b9333be495cad1cd1678ca41af9a8485cb3ba SHA-256: ffcb24704ade4f68f98a529818c62171b407d2e4c8a166fd75bdb9f75d20f292
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=internet+explorer+download+free+for+android PDF link annotation
    • https://osakadentalcare.com/contents/files/tudodowajutagu.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/25874391138.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/rowatoliv.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/wimagenozavijudafebuwa.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161369106e8c29---22769998783.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/moluridukodaxabisa.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/lidodotebunatup.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/56825571204.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/vagovegutukojenerawi.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/dokoditenaroxuru.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/dozevapokelaguzafefam.pdfIn PDF document text
    • https://mimpidia.com/contents/files/kokigexafavos.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/5931184524.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/norujelufasefore.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/4362258735.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/rotawo.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210905_123339.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/98185571116.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/62640439389.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/taludim.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/bufakezexozuganimap.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/piwowadalugunepumoze.pdfIn PDF document text
    • http://cutskytools.com/d/files/zitapikepavorip.pdfIn PDF document text
    • http://ave-france.com/pics/files/80808320018.pdfIn PDF document text
    • 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_off0000dd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 19292 bytes
SHA-256: 75e4b3fc630c07418e4bf8e7d0f03687b0762ee133f05914a4418e3f6881fdd8
font_02_sfnt_off0001284f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284F 10464 bytes
SHA-256: 00d877ffe12e86925cf3426b4c1c37d977b97f9b2ad95d0a1327e4cd683b08b5