Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ac6f03c65a5261…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 23:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fd68eef9d23d9cc5afa46e5484799531 SHA-1: d91c9d1cc443ab8edfbcbde45b0923dd9b71b206 SHA-256: 24ac6f03c65a5261b8ad690ca8a1d23500f1836083b4d976f2555c5177135c88
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic flagging it as a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and numerous external links suggest an attempt to redirect users to potentially malicious sites, possibly 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://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/sewuve.pdf In PDF document text
    • http://marcobernini.it/userfiles/files/bugokusezat.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161338aaf342ac---81103002382.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/21522199054.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/52149331279.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/2329241939.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/vofobunewuxetefojilarup.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/wogivivesonagogoberazagi.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/lazogasonumunerepobaw.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/53625506493.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/navepoxu.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/jerixavuwuma.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/xixozumakap.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/nonofuxikaresawutaboloni.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/31514125532.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///tigolafef.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/bosewe.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/70894503670.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33498994404.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/93772730696.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/67797185369.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/lozevowip.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/subugovibo.pdfIn PDF document text
    • http://labonscafe.com/userfiles/vipowukuboletiduzopob.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/danume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=die+hard+android+gamePDF 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_off0000da3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3E 10384 bytes
SHA-256: cc160c45c78d09ecee7259dbc2c45b5e84365039b0b26b34e6aa10439f69adc1
font_01_sfnt_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 18804 bytes
SHA-256: c5066a75a8096c8a8c528c3b4f1aa6d733dffe4765a712f31986f6b334051056
font_02_sfnt_off000121da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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