Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bd2c873f425ad9…

MALICIOUS

PDF

69.2 KB Created: 2021-10-03 11:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 59b583c49535961ae8f8202d7451912a SHA-1: 56719415bc244e601cb9488298be2ed05a7fa3fd SHA-256: 51bd2c873f425ad9220a282cd73ad2f7d0dd6dd0a8367001e4bd59291fada94c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=strongest+pieces+in+chess PDF link annotation
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/37390008657.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54862298665.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/98463126098.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/rodipamakekaw.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/40325009208.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/sirujidibawupovuw.pdfIn PDF document text
    • http://konberdbio.com/upload/files/67780788066.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/kelejojegowelal.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/belakebitofosonadavig.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/12669589613.pdfIn PDF document text
    • http://przybyszewski.org/image/file/87118084303.pdfIn PDF document text
    • https://electroagro.es/pub/files/xetivamotibivuxeluwifire.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/91499217015.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/tozivetivubufe.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/petilumoniwelunekato.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6db5e4581---73416442472.pdfIn PDF document text
    • http://tid.vn/upload/files/60581949294.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7b7fd206dcdb103d9edc618480d8e5db/sudokomitikaxekajevugaf.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/66032717896.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/zobesugetunaladozoxowatiw.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/51274195155.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/mixazoviw.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/zakalivakujizozi.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_off0000b0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0DB 10520 bytes
SHA-256: e9321a0822d8926b83f2ff9a2aba9c6536afc59df1a6fcb6ad9a9563d3710abf
font_01_sfnt_off0000c8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 15048 bytes
SHA-256: 1b5b7f06de41160b136ea22fe4c7a644dc2a4794a72ba81e9aeb95d39bfc8524

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