Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fd30b65127be33…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 07:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32dea58ce55f1630516c9d57088cdc6f SHA-1: f6a5086d404fa8ccb26b39c97c282746219fbf69 SHA-256: a6fd30b65127be330ed4cc1da4d7cb78dfe7515a8a596ff09bbeddcfb7463622
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://catamma.ru/uplcv?utm_term=suzuki+violin+volume+10+pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/69820821478.pdf
    • https://prcomponents.com/ckfinder/userfiles/files/69112696491.pdf
    • https://cherrychile.cl/cherry/uploads/contenido/files/43575231347.pdf
    • http://tnslib.tools/userfiles/files/81944778397.pdf
    • http://dblbtech.com/userfiles/file/tibimarejitigok.pdf
    • https://paulogomeslda.com/userfiles/file/bopivagelesakibizo.pdf
    • https://aymexco.eu/ckfinder/userfiles/files/kekonejakanuxukogowegazek.pdf
    • http://eko-inwest.eu/upload/file/72265206684.pdf
    • http://zzzwchem.com/upload/files/78114682101.pdf
    • https://taiwan-tiaya.com/upload/tiaya_official/files/15180052484.pdf
    • https://www.passion-rnd.com/upfile/files/2021/09/08/suveziviweboz.pdf
    • https://chogmai.org/ckfinder/userfiles/files/65414574048.pdf
    • https://hirurgija.me/files/jivolir.pdf
    • https://nileagriculturalindustries.com/file/91473524093.pdf
    • http://onestep-tokyo.com/userfiles/file/suvapuzoribepidotuzusa.pdf
    • https://menokatea.com/ckfinder/userfiles/files/49554289213.pdf
    • https://merlak.ru/userfiles/file/23113511298.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/u6k156vo37d4qupmfur3nihp20/88686189123.pdf
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/migugusimezisulabegunu.pdf
    • http://talk200.com/admin/admin/uploadfiles/file/babesediwezo.pdf
    • https://kawanmto.info/contents/files/52249225044.pdf
    • http://spbmedaks.ru/sites/default/files/uploads/movunefer.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/kemaniwomu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d362.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD362 16792 bytes
font_01_sfnt_off0000eb74.bin
355a9190c8740c22415a8ca488bd25bd79bd7e020108cecdb02de0a0580331d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 18676 bytes
font_02_sfnt_off00011cb5.bin
b5e6c58a5d418f498740cca7c5392c345ebbece84b4aca234abd95f9a8a24b27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB5 10700 bytes

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