Malicious PDF — malware analysis report

Static analysis result for SHA-256 18685d2399a855e2…

MALICIOUS

PDF

71.4 KB Created: 2021-09-09 04:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da99f512927f60b3a2b0c53ac341dd25 SHA-1: e6d31fa97ad4d46a2c25d8ca948bcad040c84f5b SHA-256: 18685d2399a855e2292582a5bcf3e06db05f28d02d1b50afd18dedda8cc57df5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO poisoning campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting this. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's used to redirect users to malicious content or further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://jolanyee.com/upload/files/202109020547408693.pdf
    • http://www.photonics-science.com/ckfinder/userfiles/files/3369410286.pdf
    • https://rmduncanrealty.com/userfiles/files/simujezulomeroresabi.pdf
    • http://dj-maily.com/uploads/pages/files/tezulopez.pdf
    • https://foodvellythailand.com/upload/files/70832679518.pdf
    • http://vuatoyen.com/uploads/userfiles/file/95548093977.pdf
    • https://eingangrad.ch/userfiles/files/15441564265.pdf
    • http://huzatfokozo.hu/editor_up/58318519400.pdf
    • http://skazka76.ru/pic/userfile/taximepojafijejiwewepo.pdf
    • http://app0.linkeo.it/ckfinder/userfiles/files/53733791410.pdf
    • http://davidhammerstein.org/ckfinder/userfiles/files/9822798847.pdf
    • http://104408017.linker.tw/files/14038287093.pdf
    • https://ceylanotel.com/firma/files/lifuninaxobotikukirew.pdf
    • http://ruihuitax.com/files/file/gagobez.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/163092268674.pdf
    • http://artgraf24.pl/userfiles/file/10822538057.pdf
    • http://youil.org/userData/board/file/39938817644.pdf
    • http://augustaelectricalwork.com/editorData/file/37109273071.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/74544645716.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f4d5d27c8---17784351016.pdf
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/60882867337.pdf
    • http://www.somdattabasu.com/fckimages/file/rodegifejozepokavagivibug.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ap+us+history+review+book+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_off0000b74b.bin
07cda49e843f2009b11ec666a0494b5e31d98bc18d4231a140f8193490329942		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB74B 15776 bytes
font_01_sfnt_off0000dede.bin
2d75701681f9f9a6c9763e41b55a16108f37d7d80f8885cb37bcccbed563cf39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 10860 bytes
font_02_sfnt_off0000f80b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 16792 bytes

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