Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a6dfc57be02c38…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 02:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 937bd11cae060310a98c50d34dd68cfe SHA-1: a001e17462e270ac394027be5598c703fc02ce4d SHA-256: 23a6dfc57be02c38808558f4a048f3392c5290ddc3d1596bc213ad2a74ebfd65
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 0.9974

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://firesecurity.sk/userfiles/file/dosudug.pdf In PDF document text
    • http://jl-vacuum.com/upload/files/84059817224.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/filog.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/sujilubup.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/xibakowimafodejitokabezi.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/povaxutojit.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/82250339148.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/56203870876.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/84740450275.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/tuxedozojupa.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16136cc8662289---kugibekililowizivolub.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/dodigitapasosudepukok.pdfIn PDF document text
    • http://boldogelet.hu/media/pavarewawexanefozop.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/mividajutejudatitodit.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/75818018315.pdfIn PDF document text
    • https://mmszke.hu/files/file/17429024255.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/varifoganenorilegan.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/30804609955.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/84757289492.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/vagunarapol.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/77846999451.pdfIn PDF document text
    • http://symbolfoods.com/files/file///69107887519.pdfIn PDF document text
    • http://jonme.net/ckupload/files/kuxepokodepubavozibusizaf.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/nifobogexit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=mario+kart+7+3ds+rom+downloadPDF 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_off0000dd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD24 17212 bytes
SHA-256: fc94808af3c118388d61dd99366d2521aeb7935ff8570469c92e6953d51203ef
font_01_sfnt_off000109b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CE 10668 bytes
SHA-256: 8edee3f47be1f25cd6e8d8dc70b92cc3c1773b58f274c938b1b5a78298e5ce96

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