Malicious PDF — malware analysis report

Static analysis result for SHA-256 6534010653b71393…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 20:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a75384e275055ae652c77621415e5143 SHA-1: 6a44c5b249046d542288a4f957daf19930fb6fb6 SHA-256: 6534010653b71393bd0c38d9da88bc87d8aebb75fde4bacf5c39f7b567b48c67
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a critical heuristic firing from ML classification, and ClamAV detection as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm, and one of the extracted URLs points to such a farm. The embedded JavaScript is likely responsible for the redirection to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://myesen.life/userfiles/file/40506157607.pdf In PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/81275339781.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/1657947052614aef7a49279.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/37172724294.pdfIn PDF document text
    • https://basisnomor.com/contents/files/73173293149.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/gelizozukatizavebikikeja.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/kinuzefanulira.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/48151758782.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/namotonavito.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/bobofuvimokotugisudisotov.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/15146608093.pdfIn PDF document text
    • http://sbairs.com/datas/files/paresozidenozadokixifase.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109192114118787.pdfIn PDF document text
    • http://langmypham.com/luutru/files/67897421077.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/6993757836.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/36948538685.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/bugajiji.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/63872617162.pdfIn PDF document text
    • https://nistd.in/userfiles/file/80315122158.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/gekosisetojivukaku.pdfIn PDF document text
    • http://pjteam.hu/uploads/27645202821.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/5323188329.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/79832017015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=hack+8+ball+pool+android+long+linePDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/67586969572.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_off0000ae91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE91 10852 bytes
SHA-256: 745264c836b37afece8060ae82cebe3e817c1820b0e587053b9464fda92cf54f
font_01_sfnt_off0000c741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC741 16032 bytes
SHA-256: 9f9373c172ddbadc6c4fc124c4c41f6b3f272629a9d602c54b77cb424b22af4e
font_02_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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