Malicious PDF — malware analysis report

Static analysis result for SHA-256 84baba87078ace8a…

MALICIOUS

PDF

68.3 KB Created: 2021-09-24 19:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb67ec61a40fe6ed0c07317fd3aced8f SHA-1: 9e6495ea80a5a60b9335ca5b10ed977eb794adb0 SHA-256: 84baba87078ace8af345205b64b855ced9eb465fb6197b9156b90295393de1b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://krisoc.ru/uplcv?utm_term=beauty+plus+original+apk PDF link annotation
    • http://ipayon.com/root/FCKeditor/file/76863680472.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/72552370150.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109050054075284.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138aa68c0647---rabiwuzugafawenox.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/63721205261.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/fevopesizofuzedeg.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/43531809392.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/somaboraru.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-8/20210908043755340519.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/55080254589.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/68899667643.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/10225330851.pdfIn PDF document text
    • http://deltools.com/userfiles/file/kekizegewamazemenil.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/96247499337.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/69032005923.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/41251747271.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/pefakatup.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/mafugadununisesudimomexa.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/45392630922.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16139cc965d424---gepapi.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/voladonutabifomiz.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/20917201727.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_off0000ac6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6E 10784 bytes
SHA-256: 95c8003a8416fe9a7156990c7a4b10a7382fc9d98b7f2177a2c720616e8f18b4
font_01_sfnt_off0000c573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC573 15148 bytes
SHA-256: a49e46bfc90dbdccc81fc50a855b7b838774d4ae499ff9ec7bc7e1b001addaaa
font_02_sfnt_off0000ebc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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