Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d2734392c4739a…

MALICIOUS

PDF

84.3 KB Created: 2021-09-08 23:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49bfd213dd11a6a093519a3dfd1fd249 SHA-1: 261a753af1d75cfe0f429d24c809a03ac86ed245 SHA-256: 25d2734392c4739ab2f20804b4b1efe69be954e6f2c336dfffcb3c15a8897bb5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The file contains numerous embedded URLs pointing to external PDF files, suggesting it functions as a link farm or redirector to malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=how+do+you+get+uc+in+pubg PDF link annotation
    • http://happyhanool.com/ckupload/files/gazukefaninonek.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090111093873499.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/daxipexegalasewujop.pdfIn PDF document text
    • https://o-dance.com/upload/files/68092724785.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/39583380729.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/xakigagutomukutiwel.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/53556747321.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/kopibizoxodoji.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/jiwukilamanulojuwe.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/71001644770.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/27225289823.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/35376227760.pdfIn PDF document text
    • https://schmitz.cz/res/file/56139860806.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/zarozifutanakejol.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/22722196430.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/43570077901.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/9214680309.pdfIn PDF document text
    • http://christopherdallo.com/file/beguzixatasemix.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/kunabuwegagogilezofi.pdfIn PDF document text
    • http://mamam.by/upload/File/file/77724319214.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/18148392047.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/fidinot.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/fimebalozonokokolowadap.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2cf5cd66d---povegibudobozifuvaguzawax.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_off0000e1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BB 19292 bytes
SHA-256: d6720ba52fb72c9fefe226822c60eed60dabe4f6bcbe9151778acca49302c5d6
font_02_sfnt_off00012bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB9 10644 bytes
SHA-256: 551e17b2eb5faa63e861b3a471c04cc89da669d485380ec40b305616496043b5

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