Malicious PDF — malware analysis report

Static analysis result for SHA-256 087e45386f2623b9…

MALICIOUS

PDF

79.6 KB Created: 2021-09-11 07:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2b3132a3beb12fc86393d3d5ebaac017 SHA-1: 31dc6f6a9924c016d54d75b43c19e39d4a4e1327 SHA-256: 087e45386f2623b94d6a4d5774df63a99dddd6a6213bb230e320e095da835def
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a high density of embedded links pointing to various domains, suggesting an attempt to redirect users to potentially malicious websites. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ipekyolumedya.com/resim_galeri/file/xepovexi.pdf In PDF document text
    • http://balone.net/_upload/file///vugaratolewenonoja.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/datagovodozilokixuza.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109051550425435.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/88737898276.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/rawanunurazirevifopod.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/banupojonapete.pdfIn PDF document text
    • http://01host.ru/userfiles/files/miluturilemixetipemiw.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161391a0258a77---daweviruwumoderibi.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/zazirebejunodamazapum.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/19336676159.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/36477524541.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe313ed29---zudesi.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/mazegotudipajogatiru.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/60785459335.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/96486476928.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/pomifitamopirudabodi.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/38360698686.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/88553996794.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/84165442856.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/44170714475.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/58883946266.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=where+do+i+find+saved+pages+on+my+phonePDF 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_off0000d21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 10976 bytes
SHA-256: baef5895864da9fb6ef216eba913a6b8ebcb0b84138b7cfa97acd05200fc0e21
font_02_sfnt_off00010354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 17504 bytes
SHA-256: 787999000fa555d290b959707ca07c53ad2d5b3bcda42697e9127f30d49f5a81

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