Malicious PDF — malware analysis report

Static analysis result for SHA-256 922fc987223a71d2…

MALICIOUS

PDF

76.6 KB Created: 2021-09-12 14:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4b15ab33cca483d2d4de733af38ad4b6 SHA-1: 5db3d59989768258ebce033857b00811f62d8559 SHA-256: 922fc987223a71d26dc1796d63cdd8decacb249de5b89273d8a94f3b9cbe1619
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also functions as a link farm, directing users to multiple disposable hosting domains, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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://coretry.ru/uplcv?utm_term=the+book+of+life+pdf+krishnamurti PDF link annotation
    • http://aroma-es.red/yamituki-n/uploads/files/tukubetaxufogebim.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/vurabotadatogasukitepi.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/woviraf.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a032d933e4---90945316155.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/49150646562.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45558954679.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/68788706789.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/dosesutasuvutij.pdfIn PDF document text
    • https://orrizon.ru/images/file/vekerigopexu.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/8385611236.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210912_257FB4C6FCB201AD.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/98498326149.pdfIn PDF document text
    • http://rem-proekt.com/f/file/62690675134.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/53788374474.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/vawoka.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/15569722853.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddcd41d7c4---46395863394.pdfIn PDF document text
    • https://primer-spb.ru/files/files/tibolebumalum.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/pizozaxadigawijomen.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/33149494651.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/56116963169.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/52975893867.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/xatubex.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_off0000c6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 11060 bytes
SHA-256: 35aeb99b34e0736a876ee64a2596e6e6f75ffc44134582fe5e958235b032cb89
font_02_sfnt_off0000f813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF813 17472 bytes
SHA-256: 21da7b96f675a6b03a5d91a87bd7a5d413cd994083a95c55c4014ccca882fc2b

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