Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d9fe9e77576bed…

MALICIOUS

PDF

102.4 KB Created: 2021-09-20 16:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d3493bfc7dd73967b6dd6ac66622eec SHA-1: 301858d654889f51933fd331a71f956b4260c368 SHA-256: 83d9fe9e77576bede6177b221c851b1a8ec6559352c8d6dd760c2b5e1abfb4a8
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for link farms and phishing lures. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://synerhu.ru/uplcv?utm_term=the+open+window+by+saki+pdf PDF link annotation
    • https://nichecnk.leaddeehub.com/userfiles/files/93978724450.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/tiwotusasenolukoxenun.pdfIn PDF document text
    • http://fxlcd.com/upload/file/45833150346.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/12686491204.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/78433624390.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/wetiremurod.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/70064192248.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/64348868984.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/vebuwunusepapisomizazak.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210916_23AD5ADA7405F50B.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/60677032202.pdfIn PDF document text
    • http://jonme.net/ckupload/files/94318103589.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9dcbf6b3fe74900968e1a9dde99c10aa/63883665631.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161fbc8440---73520288684.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/wirifebadigepigakowunu.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/47000325541.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/nefuguralike.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/milezixixafovida.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/62415404170.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/lebirefapobokukesosiwu.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/11197699458.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/93474729922.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_off0001291d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291D 19332 bytes
SHA-256: cd30470193cff1fac6d33e22da316ec64b656762d5be903d5b78f7df6abd4dc2
font_01_sfnt_off00015b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17376 10744 bytes
SHA-256: d482b5ec37cdf808523e6ea167602e6aad3d520575fbf902f5778db80e712313

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