Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81f603cd46e5453…

MALICIOUS

PDF

68.4 KB Created: 2021-09-29 06:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ee841e3f7bf25c5f9a861b5f9b2e059 SHA-1: 20551c943fd776d3ebc0a081fc7b28fa77c3de77 SHA-256: f81f603cd46e5453790d8c7e1bc3d76a335269e4cc48a294474a4b3ffda7a6aa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=average+rate+of+change+formula PDF link annotation
    • http://lexprikson.com/admin/style/images/userfiles/file/39787742088.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/ruxoxasixiwarulovum.pdfIn PDF document text
    • http://amkchem.com/upload/files/65172845898.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/87859035594.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/jewevum.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/zigajalebavejaw.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/39791166557.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/51034514051.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/43281273759.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/denuvorinaguxat.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/pugasisutasujeripotogano.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/kutakumedikazegenu.pdfIn PDF document text
    • http://xn--80aaab5bgii0ck.xn--p1ai/ckfinder/userfiles/files/jelakusero.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17330471952.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/kasituravutino.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614fa02a4f67d---rasimimodawuwavegot.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/sisok.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/jopivag.pdfIn PDF document text
    • http://dhalahoredeals.com/survey/userfiles/files/86871880278.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/73775101324.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210909033441.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_off0000ac96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A8 15404 bytes
SHA-256: bb57c80a8c3a578d0f399b64c8e666b5cefd2744660a1caf59ca4d561a0a67b2
font_02_sfnt_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 10668 bytes
SHA-256: 508bfe12ff98f5a9ad1f1e16364a8fad27fb2c661fd506d554f6d6ac6ea105f7

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