Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce5da99e64d18d47…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 09:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b22be9d604c82d0b7950c21a8e96b6e8 SHA-1: 55f2dd114e8437f805bf881dd12bed2cad6e16b2 SHA-256: ce5da99e64d18d478ce2bfa0090c08caabbac685e194842ae161b7b3b4b641d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous PDF files on distinct domains, likely to obscure malicious redirects. The embedded URLs and the PDF structure suggest an attempt to lure users to external sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://cicadit.ro/UserFiles/file/goloforukonuvojosevigelop.pdf In PDF document text
    • https://marcvandewiele.com/userfiles/file/97608010276.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/23846820309.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/jarebazut.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/53707112222.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16138c370db6ae---veropemizavib.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/biboziziwi.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/gujufunowipapemukefeni.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/18000257214.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419ba9740f4---59047046712.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329a14349a3---54509314485.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/32545339346.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/giwepebepiteb.pdfIn PDF document text
    • http://3sdent.com/upload/files/lokulikewitasurenupex.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210911141434.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/59082570238.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/zipuboratematuvafujof.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/24986935907.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/28078269772.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/80169566867.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/28820513473.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210912152959.pdfIn PDF document text
    • http://www.grifin.sk/files/zogedaf.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/takivasixebosof.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/sawufosimalubogozixine.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/73022886764.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/68638950707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=neuromancer+graphic+novel+read+onlinePDF 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_off0000d965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD965 17348 bytes
SHA-256: e5e90ba1b69632e65d961f64cd055e8c74390b02376a0447fac749b63e0c4342
font_01_sfnt_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E29 10840 bytes
SHA-256: f91e15d210e449c91dffca16931329af09093a80ac7cc91cb9a9eca0d9eb0f95