Malicious PDF — malware analysis report

Static analysis result for SHA-256 33935975974d830a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-18 21:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ef102c142835f7ac60b064eb3dbeb3a SHA-1: 75df1b2bbe22e43a77f4c846f78cf03fb77fa261 SHA-256: 33935975974d830a16b23d15cfbe048216e1a22a828eb0d2e2c399dba8e94fe5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to PDF files on potentially disposable domains, suggests a phishing or scam lure. The embedded JavaScript likely serves to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://saleskerala.com/ckfinder/userfiles/files/vuluzigifodebagatiwone.pdf In PDF document text
    • http://hoya-system.com/uploads/files/202109032038081721.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/44523138554.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/sosakoxemujo.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/lupujivixubenutolozirik.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/funokowunizeradumemowa.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/gukafam.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/19879173745.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/vebonogofaduwovaxedidoj.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/jixiwevokoliwadowatatono.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/50852997877.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sizilenofuxefe.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145dc85cd35d---bumowofumagatemilovuv.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/xakus.pdfIn PDF document text
    • http://orlickachata.cz/files/files/53222961978.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/15068645148.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/11726106241.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/xilimigaserubeximogaduro.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/degus.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/49967330222.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/72678901244.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=super+smash+bros+melee+romsPDF 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_off0000ba43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA43 16100 bytes
SHA-256: 992be7545e16b10c5859f11a0351717530b761ef8cd8c8da9ce7727fb00aae3a
font_01_sfnt_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 10540 bytes
SHA-256: 42b2be23bc2a4e4ed27eb3ccf28d6ae4124a0ee382f93faa065c19a3c28e6059

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