Malicious PDF — malware analysis report

Static analysis result for SHA-256 c327d163d45b0e1a…

MALICIOUS

PDF

86.7 KB Created: 2021-09-13 04:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94fb96a56e8566a6488ae4f52d25b488 SHA-1: a8b8206303f653937d78296edec5bbb5e5c0b5c6 SHA-256: c327d163d45b0e1a4376b0f54e13abbebacd9ace29e265e431eb166f8879b411
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. While no scripts were extracted, the PDF structure and URL distribution suggest a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://abpaluso.com/upload/file/84690655745.pdf
    • http://vitalchurchesinstitute.com/files/file/41546749823.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f66c263d1---jeniverebefumudisabuwirax.pdf
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/9083317110.pdf
    • http://srs-budapest.hu/uploads/files/50723756923.pdf
    • https://fertilizerproductionprocess.com/d/files/pawuboburimolasubewana.pdf
    • http://mprime.net/ckfinder/userfiles/files/fuzejuzazegifis.pdf
    • http://ipcmanpower.com/admin/style/images/userfiles/file/bulozivanuzemi.pdf
    • http://posekatzahradu.cz/files/file/84846847409.pdf
    • http://netdepphunu.vn/images/userfiles/file/wapades.pdf
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/67886811121.pdf
    • http://gernano.eu/gfx/userfiles/files/20895245529.pdf
    • http://qqwandai.com/uploadfile/file/56553455986.pdf
    • https://datxeninhbinh.com/data/dulieu/files/sonifumekuvafugemutilas.pdf
    • https://malinaionescu.ro/userfiles/file/41515768218.pdf
    • https://kenkochaya.com/user_data/ckfinder/files/gutavo.pdf
    • http://solemarservizi.it/userfiles/files/83362777473.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/f1d911711794888442d9ebaee6ca5fdb/86460254914.pdf
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/6690648440.pdf
    • https://dangeloremodeling.com/nbloom/fckuploads/file/57321960336.pdf
    • http://workcoop.org/fckeditor/userimages/file/20210902062653.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/peketojiwetozelixawagen.pdf
    • http://nicolalazzarotto.com/userfiles/files/wanisa.pdf
    • https://epagneuls-bretons.fr/caningest/images/file/mamatixiv.pdf
    • http://datacomsystems.cz/userfiles/file/8690954032.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mass+text+vs+group+mms+android
    • 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_off0000ed48.bin
7d7f89ae4d076b3654b481d7da2a4e568c906127021e3770a5d1ecc23a9c8786		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 17748 bytes
font_01_sfnt_off00011b63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 16792 bytes
font_02_sfnt_off0001337a.bin
9f782d5b526fb7e776a974a20707d287d1aaa503e19d576cafcdb5df69d194c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1337A 10952 bytes

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