Malicious PDF — malware analysis report

Static analysis result for SHA-256 918bf1b9d413a6db…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 04:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0d2218729fa1a5d5a095d747bd7cd511 SHA-1: e332f68cd19da462b4632893bf2066ed02aeeac0 SHA-256: 918bf1b9d413a6db793e08f9e0ccfc727c08e83be6f49400a6586f3d2128f90e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm, pointing to numerous disposable domains, which is a common tactic for phishing or distributing further malware. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest the document's purpose is to redirect users to malicious sites.

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://eledigitalpr.it/allegati/file/45125449971.pdf In PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/42746566950.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/42142698441.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b59b8cf40d---73615125611.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/5948057215.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/7082634362.pdfIn PDF document text
    • http://videocycling.info/files/file/3068357873.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0549f645b53ed49a53080f4765fd7442/29752397128.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/20765059339.pdfIn PDF document text
    • http://hkwwta.org/userfiles/kalox.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/66921814388.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/rozoguwipapofuj.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/13909254496.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/gosamenaputosovagitodako.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/biwefajisazubulor.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/31247187573.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/13/59825362412.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/sodepatabudedel.pdfIn PDF document text
    • http://horvathortho.hu/tmp/28163512578.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090515124973499.pdfIn PDF document text
    • http://medica-brno.com/files/butoxu.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/sivawaxuxuxepetagelufo.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/dorufowinetupa.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/73100896561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cracking+toefl+ibt+pdf+2020PDF 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_off0000d218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD218 11132 bytes
SHA-256: 2c14ab2bacc7017fba63ae262d6887a5fcb691e8cdad762077e3a5a78d04ff20
font_01_sfnt_off0000ebd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD1 18068 bytes
SHA-256: bd8f6b4ad44bdb87368d2764d1c2e7379e316059a57e3939eaad212f2b4b3bce
font_02_sfnt_off00011aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1