Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ef90f70bc270ad…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 14:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cc557d1cb69b63bb09cf07b475ec0c14 SHA-1: 4b7d50b30c49dcfa27bdf251052b62820327bad1 SHA-256: 50ef90f70bc270adca4cf308c833aa7bd7596b2ddc847c44afc78adf0a17a030
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://parfumerieindex.nl/images/uploads/lavaketemexawomi.pdf In PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/kupiladawikawegunebug.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/56925838866.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/gonekapowaviv.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/70731188736.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210904115822.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/66256035478.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5d10ca15496f46d13ce3cad30878e385/sivipovilavazare.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/60243146711.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/59938700433.pdfIn PDF document text
    • https://olterus.net/contents/files/62751965836.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161358aee30e0a---xuwuzefusobimadarajopugi.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/rakisegiworuwot.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/31077419783.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/5880177029.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/35025127.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zefugum.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/12158093299.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/wozijasij.pdfIn PDF document text
    • https://equimat-cheval.fr/file/wofulewefubigipise.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/vazifarofusar.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/damagepirigonesasa.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/niped.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=angel+number+555+spiritual+meaningPDF 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_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 17404 bytes
SHA-256: 28998d537e25c11d2f46b6f80e07832ff5135cc7136006fd159406ce5cc1d742
font_01_sfnt_off0001057f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057F 10828 bytes
SHA-256: d84e96bc7bb00ffbf593e33441cf565776bcb2ee0c70ad2b775c8d45da241771
font_02_sfnt_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1