Malicious PDF — malware analysis report

Static analysis result for SHA-256 10df9d6c660373a4…

MALICIOUS

PDF

89.2 KB Created: 2021-09-19 02:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 872f355364cd0a4bd9c45e1af6d4bddf SHA-1: bb0cd50ef983e1f98c41f02e2c28b59bab48e3ad SHA-256: 10df9d6c660373a45f229cc30000d8df82142eab76e5f87cba5ad13e1d1476e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. The PDF contains a large number of embedded URLs, many of which point to unknown domains, suggesting a phishing or link-farming attempt. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a2780f9bb---60270200869.pdf In PDF document text
    • https://cissud.com/uploads/ck_editor/files/87257657516.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/18/file/vupisevifaribux.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/15542649439.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/jafoberesotodirikovulir.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/54385975471.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/58750321883.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/25737121701.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/86260561871.pdfIn PDF document text
    • https://ibericadearmerias.com/file/72767474075.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/16415130393.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d490bdf3be---pufuxakilodazusulugugiv.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/92904626115.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109170551352163.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/76145568421.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/gebaxafububilavus.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/koroxefu.pdfIn PDF document text
    • https://biodez.lt/i/File/luwoxivumowajemipiribosat.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/dekogevowuxilizuzipagiva.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/milijajodekufape.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/togefapepigafalagufis.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/40938878330.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/97104225149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=recording+studios+around+mePDF 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_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBF 10812 bytes
SHA-256: 31eb0230d34f7f3ccb8a2bd79a02c7e8395778588defb58044ccf58ea590259c
font_02_sfnt_off0001287d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287D 17912 bytes
SHA-256: 701d4644d556c626a357b130c58e39655a370d4c810cbe0277d2c2529a888b74

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