Malicious PDF — malware analysis report

Static analysis result for SHA-256 29af2c31ba17830a…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 02:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ce18405b30c6b836f314058a8ce86db0 SHA-1: cc8cf82adbb65064fda97cf53a1e289cace08b6c SHA-256: 29af2c31ba17830a0dd3c8dd000a32b4df53c1206cd0eaaa608bd0bbacd8aecd
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to external, potentially malicious PDFs hosted on domains like cafesezony.ru, likely as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 4

  • 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://cafesezony.ru/fck_editor_files/files/kubewufodenelubiromowi.pdf In PDF document text
    • http://dsfly.com/uploads/files/watukux.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/mototebiripemunivi.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/3124563618.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/51065189398.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/18018770918.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/jivobisenazuzirida.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/timavitizowusunamuw.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/dawamulamumeval.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/36707666369.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/wenemisadisubolex.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/gimusepinabatuwapumigako.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/marenanax.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/kumetenizogep.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/gilukovolaxibadaro.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/17048251262.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/vudowagozot.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/99f54aee199caeb8f864ffb3ac1f626d/99636543490.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/35050857165.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/37023244480.pdfIn PDF document text
    • http://ndfeef.com/radiant/mechimobiles/userfiles/files/18093201201.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-12/20210912141802592042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=recover+android+after+factory+resetPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/95168255034.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_off0000afc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC9 15168 bytes
SHA-256: ee889a4dfd2009cef03b67392002f65660de2b7b18c2b9db232e856a019e6c80
font_01_sfnt_off0000d64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 10648 bytes
SHA-256: 8d9785d0c6310d18a84aa2cfdfebc2b48eb9f87305a745f8cbd7060c88ff2747

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