Malicious PDF — malware analysis report

Static analysis result for SHA-256 388c8216f1ce57ee…

MALICIOUS

PDF

93.1 KB Created: 2021-09-11 05:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2f7665533d3fcb664023ff7b88cea3f4 SHA-1: b63007088ee1b02657b13f350ad7df113eb86777 SHA-256: 388c8216f1ce57ee1a1467f619e35bd99b352de53247ef380968df797c7c4a4b
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 0.9965

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://allytemp.ru/uplcv?utm_term=suicide+squad+2021+streaming PDF link annotation
    • http://preciz.com/uploads/wysiwyg/files/12284683617.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109010956546823.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/bejesakejopa.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/74326413665.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/56862515271.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dc447abfa---97438492731.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16138621d89471---66885506288.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/renesefufejupakas.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/48565029341.pdfIn PDF document text
    • https://bdata.vn/upload/files/bagurexoduxatadum.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/77891624172.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/xufuluj.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161345eada6c83---59740653125.pdfIn PDF document text
    • http://gr-chem.com/upload/files/28578688657.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/fomizapagofixasibifama.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/44539555196.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/7973883001.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/nobasizabokomigolebesoped.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631201113.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/zajiguto.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/rafab.pdfIn PDF document text
    • http://tid.vn/upload/files/49492778616.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/sapapadazelusafobawadid.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/18694009204.pdfIn PDF document text
    • 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_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 19024 bytes
SHA-256: b122c025b239f2e31315770880f425cb7bea3684250bbe4785f85e020040987d
font_01_sfnt_off00013512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D29 11160 bytes
SHA-256: 6d688a1501baaa4070ac0c9cc6df2403ddaf7734922ab64c886fc4ea112fc6c3

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