Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0d53c2a39bf2d18…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 06:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d48339d184e7e0f3c8c45ed97a250e0b SHA-1: 721ab4ad7eb75e2b9fefd801081086b6517a4446 SHA-256: d0d53c2a39bf2d18fba7a49b2af157384bec8c3baa90a759ba5915836f141659
66 Risk Score

Malware Insights

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

The PDF contains a high number of embedded URIs, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm designed to redirect users. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=battleground+survival+mod+apk
    • http://eros-arena-reutlingen.de/eros/userfiles/file/50507515040.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16152f6c7e1d9e---difusozage.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee435c8910---23046838346.pdf
    • https://regenerateacademy.com/file/keriguxexuxezerewivupa.pdf
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/46432459643.pdf
    • http://kibunajcc.com/ckfinder/userfiles/files/16501900662.pdf
    • http://megat.pl/uploaded/fck_files/file/34003386691.pdf
    • http://jawarakreasi.com/file/mimakid.pdf
    • http://giaodantanthaison.com/Images_upload/files/golilafasuti.pdf
    • http://elai.kz/upload/2021/09files/210914112834613181bvzce.pdf
    • https://ijfbacknumber.com/editor_up/febetugifeludibipewip.pdf
    • http://appli-veolia.net/ckfinder/userfiles/files/pabavosenewinuvu.pdf
    • http://remaining-mc.de/userfiles/file/mezofelikonupizupukejexi.pdf
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/86208602458.pdf
    • https://lazdynumokykla.lt/userfiles/file/wogubumofaxu.pdf
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/15108380897.pdf
    • https://tarzminder.com/resimler/files/wowinojijalinokowileg.pdf
    • http://opusbiz.kr/data/editor/file/625613242613e59a187239.pdf
    • http://land89.com/ckupload/files/kesekej.pdf
    • http://auburn-companies.com/userfiles/files/vipulenogejibunexe.pdf
    • http://medicamarsala.it/userfiles/files/tiwenojodowevonosamiw.pdf
    • http://afghansolar.com/userfiles/file/2253277612.pdf
    • http://aorganboys.handyfriendship.com/upload/files/59122859470.pdf
    • https://tourgardan.com/basefile/tourgardancom/files/duwoxonowixavipagipujiji.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_off0000afe9.bin
6e40da321b9dd627dd63e0e1dda625b35c5ad5223c63234f375d24445dcde705		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE9 16048 bytes
font_01_sfnt_off0000d8fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 16792 bytes
font_02_sfnt_off0000f114.bin
b15cffea431133f2f40e26f9f989177f44dca3e5463aeefda0d91f1a04a8f34f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF114 11044 bytes

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