Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3d75061c2a1d03…

MALICIOUS

PDF

75.8 KB Created: 2021-09-08 23:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6123fe1d955d41d599aef0f23ecc714d SHA-1: 7979be0f48c853e4b899f1322004a0403039d4c9 SHA-256: 5c3d75061c2a1d0368ffc94cb129a931d33572b2ff704ca6cb4197fc4be93d1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is a link farm designed to obscure its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=descargar+epsxe+para+android+apk PDF link annotation
    • http://tsuiteru66.com/userfiles/file/vevolaxusagapu.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/sulefolevepi.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/97810464887.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/78221831561.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/raxenil.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/xoturoxi.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/44123300033.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/jobobokinegizugo.pdfIn PDF document text
    • http://grimastone.ru/files/sivevevaxeboza.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/fekaxuf.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/89246474084.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/wemojovixakavemifiwe.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/dizalepufukegivelafu.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/neporusolilup.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/43911242778.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/gebefuvosotuxaxop.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/vepomikejin.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff7638f145---82074284849.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/60643551372.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/18249686586.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/jizawitatijujinetosavo.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/libunaferofu.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/4870357415.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/podixusirinadorip.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/xewoxujiwazonuzozetojoda.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_off0000c057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 18456 bytes
SHA-256: d0c50997364e66a4024a5e251455c1376f544922d22578f6234b9f343e71d982
font_02_sfnt_off000108e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 10740 bytes
SHA-256: dd733d58b8970ddbb34cc9e2872190f9185a5b2785b87e24b5c8e7333490c184