Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de0b2e52581b3f1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 19:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e38ccb62c3876294edbf10ed719f3788 SHA-1: 85fca547bc8182c3ffe5302b8fee147ad52f6fbd SHA-256: 3de0b2e52581b3f10a55b38bc4fa93221807aae9fa5965341b7037e622a6e5cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are used to redirect users to potentially malicious content, such as phishing pages or malware download sites. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=online+casino+sign+up+bonus+no+deposit+mobile+australia PDF link annotation
    • http://kangmeideyiliao.com/uploadfile/file///2021091112341577.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/demupatigibon.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/30728971292.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/junogotafibosuwanomedo.pdfIn PDF document text
    • https://thehouseproduction.net/file/lemobanogidesejibewimo.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56665075707.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/vemodukedubuwurajemafe.pdfIn PDF document text
    • http://minerva-collection.net/files/files/11199985450.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/jeforozow.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/xodunufit.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/91509883324.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/wilis.pdfIn PDF document text
    • http://robbes.nl/media/files/21488642419.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/pifuvel.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/xafajagesulano.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/15285305432.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/16878868783.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/wazusoganoxejapamuze.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/jugazetasigenajofexezab.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343fb35e3c7---demaxagojonoxugetubew.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/pogijazekojapowe.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109022344274142.pdfIn PDF document text
    • http://wych123.com/upload/files/95870194413.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/ranopuzas.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_off0000d2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A3 11120 bytes
SHA-256: ba58038e7f291af8d1e7f553e32dcd70cd5760edd1f98b6c0b53133834070d3a
font_01_sfnt_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 17960 bytes
SHA-256: edc817182a9d6b90682910929e888826f9ec4e4d885636e8d7dcf94f17fd1780