Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4e467c577a7f1b…

MALICIOUS

PDF

99.6 KB Created: 2021-09-16 14:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba6b602292637930a79748c95400bde3 SHA-1: 48114ec6db1f35c7fdd6a0ee08dda63e42c75a6c SHA-256: 2a4e467c577a7f1b6fe3b2958b84e90eed0c6e77cfa0921e5e7b3ecf7901ba43
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicating a link farm or distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern as a non-clustered link farm on disposable hosting, suggesting a malicious intent to manipulate search engine results or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://dnmpaint.com/sdcc/images/file/67526334632.pdf
    • https://bccphil.paramedix.biz/uploadfiles/file/megasodezilik.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/96170258223.pdf
    • http://malir-naterac.info/UserFiles/File/92360815533.pdf
    • https://zerling.eu/nico/images/files/84590260213.pdf
    • https://bem-sa.com/img/file/niwozaretapazovut.pdf
    • https://delphin-bau.com/ckfinder/upload/files/58789702756.pdf
    • http://cjmfgx.morefriendship.com/upload/files/79009569712.pdf
    • http://pk.mo/userfiles/file/soziluxexilatutusifubovot.pdf
    • https://www.ftha.org/admin/ckfinder/userfiles/files/jewuditejitesodasiruw.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140948526fb9---mabusisufarufi.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136a9731e58a---78772000891.pdf
    • http://koslita.eu/ckfinder/userfiles/files/48404981122.pdf
    • http://canshu.dlzj.net/upload/files/20210913003715190144.pdf
    • http://bluebossa.pl/files/file/70494599359.pdf
    • https://ripedzn.com/app/webroot/files/fckeditor/file/13750891920.pdf
    • https://mobiligennari.com/userfiles/file/27450472685.pdf
    • http://azseal.net/uploads/userfiles/file/47226487251.pdf
    • https://suprizpin.com/calisma2/files/uploads/suxabo.pdf
    • http://olddieselparts.com/ckfinder/userfiles/files/45923111892.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/savovaregoli.pdf
    • https://myparrotfood.com/user_files/files/sisavuvapipefaku.pdf
    • https://bdata.vn/upload/files/sajufugovokafuzonalimil.pdf
    • http://www.sandipmallick.com/fckimages/file/linitenixososajem.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+free+up+space+on+phone
    • 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_off0001223d.bin
43b1ba0f447bc100cd042dcec35c38b3cf9c77edf9a673d8828a1ca15e8358d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1223D 18012 bytes
font_01_sfnt_off00015021.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15021 16792 bytes
font_02_sfnt_off00016838.bin
ed5c8714ffaadde2c39c2938a0c8db3af42314dd56e2c73061385d472c4e9f18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16838 10616 bytes

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