Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aeed4dff29b435e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 23:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 64eec657557a574c5ab69bbdad2f3337 SHA-1: 660f9900b4ff7426d291089bf2500831747686ba SHA-256: 3aeed4dff29b435ef82ece8f3479c077b7fb9cff695a5d7aecd320258e383d39
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://spbmedaks.ru/sites/default/files/uploads/xufuporoxozibefojinogase.pdf In PDF document text
    • https://ww150001.linebot.net/upfile/files/20210908111236.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/govubuwisowuluba.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/44593706290.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/jafaba.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/wiful.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/6852071774.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/zunodubofepe.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/kumajadeda.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/68680242241.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/siwetiwazob.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd8e9df79---jovob.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161385c28cd9bb---sifojagu.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/39841808086.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/sapenubumuretesopo.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/19402066667.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210907_152248.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/losamunanifipulirixalesu.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/noxovorawe.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/48726118780.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/85536234189.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/73917443561.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/35106742136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=for+how+long+is+cooked+chicken+good+in+the+fridgePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 10748 bytes
SHA-256: 64d71849da88a7743d47909c9dfd9e44fac831d68d6647bd99651fce255f2bb5
font_01_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 17360 bytes
SHA-256: f7ea866ff1d19c34e037014c8e61016e677a40ab964fe178dcfae815ac471dd2

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