Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f570581e323ed0…

MALICIOUS

PDF

89.7 KB Created: 2021-09-19 15:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f3c9287a6fb70d92911bfeb951aea39 SHA-1: 016a671b57fa9688fbaf52e4fcdb2a2b235d6feb SHA-256: 28f570581e323ed09e6ebc200bc483f42fe194ba926d1728a5798fea33ff0062
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://unicorn-furnitures.com/d/files/kogosibedo.pdf In PDF document text
    • http://brilsports.ro/userfiles/file///66952387437.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62533727053.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/xufit.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/51546807791.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/vukaroj.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/xediludevor.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/72549537611.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/77388149470.pdfIn PDF document text
    • https://gdaniec.com/upload/files/sozetidugigenuraxinexadug.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/kelasunubuxiturosovajibat.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/tasipabevadugupobudogime.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/suwuwomogasodufeden.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/41eda4cfae056d4a00d049ec85dc159a/41172324684.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/30512669638.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/27823282541.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/jegujemalene.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/54458518929.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/84175639686.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/vomubujemavuwezitugovis.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/77123307387.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/vesapukidokot.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613de3d63012d---93332935294.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=that+time+i+got+reincarnated+as+a+slime+game+iosPDF 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_off0000f85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 18636 bytes
SHA-256: 86ddfb172ffbd73bc64eb73ecb254c511809eb89b7df70c7f596b9ade9594343
font_01_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 10780 bytes
SHA-256: 3e356e4aec31a568afc58534bbb890b3729a152cf64a2960c13cebecbdef102f
font_02_sfnt_off00014086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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