Malicious PDF — malware analysis report

Static analysis result for SHA-256 a733e5bd4d725a1a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-15 03:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64dcbc784f5a98f6e3e88e60f02fb839 SHA-1: 68dc9881e146e4c07f1581959c2a27b00f5ef3d9 SHA-256: a733e5bd4d725a1a67a2880e52f946e242505953f67e7903cc780546e00148a0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=recover+pattern+lock+in+android PDF link annotation
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/fonigipalabesageserokatur.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/ridesagupajopejip.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/53631520015.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/labikaviros.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/43828413373.pdfIn PDF document text
    • http://plise.org/userfiles/file/mobowipidakotuwiguj.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/savosusoditu.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/jovojonoweduxeni.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/99433150047.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/97844601539.pdfIn PDF document text
    • http://venkateshservices.com/uploads/wutubeligudaxugototibex.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/marumizigigu.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/33711058444.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/59161779395.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/wexeminiwenubunul.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/wegonoveg.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/tamijoret.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/16335487686.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/bonabuwuzawoludin.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/3979344623.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141163a23236---59715085485.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/30493325163.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/29971838088.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_off0000da21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 18056 bytes
SHA-256: 603834b0f0bbddfedf788ac4a24b00f5ffe577cb4178427af5b2fe76e0a39ad1
font_02_sfnt_off0001208a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208A 10544 bytes
SHA-256: adb7ff3cd5ed082cb335f24dee2fadd939a02903bea21bade6a682f7d5f8e1fb

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