Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da7094d5810162e…

MALICIOUS

PDF

75.1 KB Created: 2021-09-14 01:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f00c84fbea881e27fab50aafcb42f69 SHA-1: f177b8a41b698f5c6a1d1b75ff23d08462ab6472 SHA-256: 4da7094d5810162e675abc834328eeec32d71e95581fe165af3853d798da806d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to an external URL, as indicated by the PDF_URI heuristic and the numerous external URLs found. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krisoc.ru/uplcv?utm_term=octopus+full+version+apk PDF link annotation
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/kazujisonivo.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210906_2350B918B0B9F784.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/lapuses.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/xegevudobanegidapegu.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/tudejidugebigadugijiz.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/nukatuxufa.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/37078954956.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/20094199111.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/gigaloboku.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/73915341851.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/67279022781.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/93480259685.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/jibofalunej.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/49930043254.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/janawanupixosumigivewo.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/pogesipivobutepawajuf.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/povup.pdfIn PDF document text
    • http://sswjeans.com/files/nagunituzo.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad740dabf---guvemozazitego.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/0h8n2rh3jmsnlmgrj9223sat7e/butabanikenu.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/vawewesudivatul.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/990014242.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/65829479086.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_off0000c12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12A 10756 bytes
SHA-256: 79e621b6e7ab1075aa8fd5bc6ac95abe54e620fdf028c46cc944d37cd1ac2514
font_01_sfnt_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 17148 bytes
SHA-256: ca1641f7bf83e2a0dd987b1537e10510a0dfd84f9d12e536c8eeebdb466f850b
font_02_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.