Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa040ffd9675dc4…

MALICIOUS

PDF

77.0 KB Created: 2021-09-13 20:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ad00f2899647fd8ba11544cd447e89e SHA-1: 66350bc38ea5b9ae55661fabe456f40899834d60 SHA-256: 2fa040ffd9675dc4da0185a9854ec4288cca088910ee9a7bc82c6a1a5c811ff8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://losungversorger.com/product/file/30285777978.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/zibepixirubiwotap.pdf
    • https://5uempat.com/contents/files/marewamubunat.pdf
    • http://techscreening.com/userfiles/files/lomajaveronivuvam.pdf
    • https://dom4m.de/userfiles/files/gezinufesipejazoriregub.pdf
    • https://skvely-kup.cz/files/file/bifinezukepukizur.pdf
    • https://bunyaminerdemir.com/resimler/files/boxosunidarofiji.pdf
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/13669811896.pdf
    • https://dveropolis.ru/upload_picture/78540433299.pdf
    • http://bigbazar.cz/is/images/FCKeditor/File/55922834501.pdf
    • http://qdxqw.com/uploadfile/file/63807494127.pdf
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/68526709337.pdf
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/zuruzuwu.pdf
    • http://lamorenj.com/userfiles/file/xaduvokufogoparuf.pdf
    • http://anshan56.cn/userfiles/file/16308972361242182949.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161393b0066e82---11096066487.pdf
    • http://kaupa.cz/userfiles/file/15887258776.pdf
    • http://krukewittfarms.com/userfiles/file/51374410846.pdf
    • http://canxetaidientu.com/images/file/68329460538.pdf
    • http://ydyb.com/filespath/files/20210912045919.pdf
    • https://matrixx.lu/images/zinir.pdf
    • https://kokomanis.com/contents/files/vamenuvodurifurabizulub.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/600ada5ecaab5b0b0879b245a6a67456/rupuginuluwatexurix.pdf
    • https://a-guskov.ru/uploads/files/36187260421.pdf
    • http://pazarziraat.com/userfiles/file/jovilasupuruzidowo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=guru+granth+sahib+translation+in+english+and+punjabi+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_off0000c7e2.bin
4e32d1fe1f14715c3c86d82abe2626f130e44c5efb30398e9adce823bfd440bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E2 16956 bytes
font_01_sfnt_off0000f38d.bin
896c42340fe342d4f26316646047b89ec84b2fbcca03bcd88cca6bd851b5e612		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 11188 bytes
font_02_sfnt_off00010d2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2F 16792 bytes

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