Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cba32b0e6717fd8…

MALICIOUS

PDF

71.4 KB Created: 2021-09-27 01:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 171cc9ab117920efbd0bac9caa1a560d SHA-1: ce1d197db19e3a0de325a314a8c6d5f41c03fcb9 SHA-256: 9cba32b0e6717fd8f90eff9ea73b341d53b88b6549c289a78149764b216ba1d0
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://oniceh.ru/uplcv?utm_term=andy+android+emulator+review PDF link annotation
    • https://vishalahospitality.com/ckfinder/userfiles/files/poriked.pdfIn PDF document text
    • http://packamate.com/userfiles/88383939090.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/sagokizatevibeweno.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/favabupelapoba.pdfIn PDF document text
    • https://ferropula.hr/files/dajinu.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/10889843207.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87870911255.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcb093f334---ribugasiji.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/58179704260.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/35014607778.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210924110449_315275.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/66307498347.pdfIn PDF document text
    • https://moscreen.in/cmsfiles/file/dapuredofefawejosak.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/34183151645.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/53477894611.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/vifegemudu.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/sakedura.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-1/20210901102649181107.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/58559348014.pdfIn PDF document text
    • http://platcometals.com/images/file/gudafazafulijizogofunoruw.pdfIn PDF document text
    • http://carbontuning.ru/file/mizexonuve.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/xipukezofeso.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/93443970965.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/savezinopozosogaw.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/50890373695.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614252702d402---6190979899.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/betimoparasugusawejetu.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/dadepuwufukezezuxiti.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_off0000b40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40B 16572 bytes
SHA-256: 6c229e7708e81bfc3cc9d176dc686741573f4dc7c8d95b1e6cca9b6f9bd92e4d
font_01_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 10588 bytes
SHA-256: 95475131886f432ca7d2c5b06a5df64705535644c6116a78a28483ad56e9df6e
font_02_sfnt_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1