Malicious PDF — malware analysis report

Static analysis result for SHA-256 306668890e6465c5…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 04:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 399ec9278ec4ca9b55975fbd06e1133c SHA-1: 16e7c531e6985ba5650a31ee35c0bee273390ed1 SHA-256: 306668890e6465c5d987764952e6b5984e2ce3d42af1f41e53cda29669ea7117
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are unknown and hosted on suspicious domains, suggesting a phishing or malware distribution scheme. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document attempts to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://vititanon.com/user_img/files/bolufukewasaxonimo.pdf In PDF document text
    • http://thermocomfort.ca/userfiles/file/38958193768.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/rojazap.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/solifibabalimeviletu.pdfIn PDF document text
    • https://clinicscrm.com/img/files/vafezezupen.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/2225730625.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/89984517604.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/80681877716.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/sobukeripelofevulidum.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/lebokalodezivin.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/84767172701.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/kimakedijukumiri.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/zusivobif.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/84226485737.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/99248130144.pdfIn PDF document text
    • https://anjingliar.com/contents/files/puvapetenarijekoka.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/pawozuwuwadavasijabanu.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/65029673169.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161397af659b53---19855282364.pdfIn PDF document text
    • http://citra.cl/userfiles/file/tagagimagumogidopexoli.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/zidixataxisete.pdfIn PDF document text
    • http://videlec.be/ressource/file/90876010778.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e2fbeddbb5de06c83e3320b92e5aa6b1/tokobas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=heinemann+biology+1+5th+edition+pdfPDF 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://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_off0000d630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD630 11108 bytes
SHA-256: 13a58e84a114cab043b4ac4f5793e2a456ea3fd715ec9af241e8334fac991f8c
font_01_sfnt_off0000ef7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7F 18516 bytes
SHA-256: 71262d55ce9b9ab7b4a4696098a24b263c17d30d37148d72b3888da30ebe5b3f
font_02_sfnt_off00012042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12042 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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