Malicious PDF — malware analysis report

Static analysis result for SHA-256 151f425e869bd9c7…

MALICIOUS

PDF

76.7 KB Created: 2021-09-20 18:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0fe20b8b34dc66dbb210fc0ab0946f0c SHA-1: fe74d7f8a303f2c6d21fd4ef3690f1edc503396e SHA-256: 151f425e869bd9c74fc0eb68b4f26590fc722004c73a8d4dc4415a7aeb94fe85
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish credentials. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the use of link farms on potentially compromised or disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://mmrh.myagenda.cz/pictures/editor/files/52866303961.pdf In PDF document text
    • http://bilmatbasim.com/userfiles/file/25239859710.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/buzefonirifosineseza.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/fofubibepajewe.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415018b41ac---35319278180.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/50789128749.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109122127072599.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161408e5a9d50f---53083702270.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/pefugugujufexi.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/8255907523.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/11905626274.pdfIn PDF document text
    • http://live-net.it/file/33556542230.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/nubetolaxorira.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/rakanojowusilolivik.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/68852595208.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/62821282985.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/datevezuxogukato.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/pukojekijarusovizabok.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/59257533703.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/15615912149.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/jujuzujimixuko.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/ronafetinabirapobaradan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sigma+bond+diagramPDF 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_off0000ccfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFB 16168 bytes
SHA-256: f26e7bff35f9221f5ac63cb8aac73c73928d3b83e6d88fac46217599309c255d
font_01_sfnt_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA0 10364 bytes
SHA-256: c7d8506e3667b00b1ad5a7afc7047b2b7afd10e89d8721d53da1701bb1d2ef3e

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