Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cd0676a47ff9df…

MALICIOUS

PDF

85.4 KB Created: 2021-09-11 15:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 60c5abcb8c6924a474bbd71771622cdb SHA-1: 8f2f867825a48411fec26359556bfc38dc9b4170 SHA-256: 36cd0676a47ff9df06374187e23b5cd303a71c6f54e74cafd44d0244d5694ad0
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 https://produktybhp.pl/pliki_user/File/46741200730.pdf In PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/41290907175.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210903_7E7D78C141554D4A.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/tiwatozav.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/9712084127.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/59498118710.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/rijowafin.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/58068120748.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/13233838897.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/rixisetelufanofuwitirorur.pdfIn PDF document text
    • http://getem.pl/files/file/renixibofomurixagup.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/82034206966.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161306f98cf882---kevulitepesasakem.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/38797632038.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612eede7914d0---84856969122.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/13380212337.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/kukifuk.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/38869706132.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kabawedojilif.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/sijipow.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/janowodibajazax.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/49343560720.pdfIn PDF document text
    • http://ttc-investco.com/img/files/rinojasaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=i+hereby+accept+the+offer+of+employmentPDF 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_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA7 18204 bytes
SHA-256: 86ed5831aa6d08a5424906bd822bf401bfcb0df130464b4b46a19567cfc35b4a
font_02_sfnt_off00012f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F71 10688 bytes
SHA-256: fc3cefef32995f097caae0c091368a9695da1282a17de238d78980b4421a8fd7

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