Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01714926a951b0c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-14 10:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bd4c9c8b91bc4e59a957d71257bf77d6 SHA-1: f4599569b12fea06a884680eb8b5468a4a8c622d SHA-256: d01714926a951b0c60544dde46a0f859ff52ddbe5802cf7ac1a71e756ec8a0ae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ClamAV and an ML classifier as malicious. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and heuristic firings indicate it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mavachhaiphong.com/upload/files/37161222806.pdf In PDF document text
    • http://f-okinawa.com/img/tmp/file/14827381254.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/dolelufin.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/xilepufireferopovapakir.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/7634494698.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/volikosopafakesadiwupuva.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/36172709396.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/6223880663.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/23448657736.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/kubazavixenu.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/77000566057.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/86320435134.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/nusivitizopuzoto.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398cf408473---serojefaxijex.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/37642653095.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/86667878931.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/rojenuzuvukuvonojalile.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/38997868719.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/zugokafalogererobovodepij.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50217221200.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/letiwebifit.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ekqopgshb5heu2pcki1v9eji11/98843402047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=windows+10+pro+iso+download+freePDF 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_off0000b5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C9 15008 bytes
SHA-256: b652c4d613b96ee1962f6410d4970467a5c3eda1a9d275ba26ec5e9487300df3
font_01_sfnt_off0000db78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB78 10644 bytes
SHA-256: 8422ef022c3f67541acd97ce65c90e56be65231fb51d2b309df89b02ba661fe9
font_02_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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