Malicious PDF — malware analysis report

Static analysis result for SHA-256 32d01fd5df562462…

MALICIOUS

PDF

92.6 KB Created: 2021-09-22 14:33:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d54f7f7d354ec9e7659ff32dd1712626 SHA-1: ef67a6256c84a54341db74dbcf8db4043c205a7c SHA-256: 32d01fd5df562462e55cea6097beb81f27708afd865a473604574df76e7a753a
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to various domains, suggesting a phishing or redirection scheme. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/vobipakeveduxuwomigijid.pdf In PDF document text
    • http://nceed.kr/pds/userfiles/files/99555641961.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/vekowawafuxorelekub.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/47232598715.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/68232249841.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/juzujilitaxobaxosuzoxepi.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/57474833303.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/96420806101.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443408bae7c---zipesiremusikupelegigar.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/wosise.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/pifupiwuxijebevezu.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/47584597029.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/74333953249.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/16302404499.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/tolabewu.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/8474869140.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e129d97e---tomevodomizakujilokaned.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/bikixitevitomen.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/puwododuliw.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/fasasev.pdfIn PDF document text
    • https://tempegaring.com/contents/files/mulonulaxidexat.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/vutolik.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210914152028413.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/60637275980.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/daremejazin.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/45210536228.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/lolujaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=online+bus+simulator+games+for+pcPDF 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_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CE 11088 bytes
SHA-256: e2eea45faaaae7b39b41d6f9737394b2267816138497c91908f1d70a18131951
font_02_sfnt_off0001317b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317B 19424 bytes
SHA-256: 4c91b199c5d581eecbea28297394622a7de14bdc22b681ef21386d7767b0989a