Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd53c2f07a5ac14b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 06:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55f8559977ee7c4a8858733ed13706f5 SHA-1: faf1cfb8e41e412d9513bf29cf7d9874e9742716 SHA-256: dd53c2f07a5ac14b34c12bf1033af2721bea621750e8f4d284db19868a8f2500
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely part of a phishing or malware distribution scheme. No scripts were extracted, but the presence of embedded URIs and the overall structure strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://naoshima-tours.com/images/blog/file/xowipidewinuwifolefejo.pdf In PDF document text
    • http://leeharringtonhomes.com/userfiles/file/logitugajorekidozo.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/sukokasanija.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/95759947171.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/92735393797.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/lofiwiwamotazizasuru.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/70330870654.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/voxirivirek.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f6484e8a---87281781763.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/fejupapilina.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/xibiboximirurom.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/komesewenikonawo.pdfIn PDF document text
    • http://spharma.ua/files/file/bomiwipixikatibadufom.pdfIn PDF document text
    • http://thevalleytrader.com/files/3612866835.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/bafibevotodidufubejidufa.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/sijuwosobulugokopurer.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161452e738d33d---99174589120.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/jadakinosabedelorabolulo.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/60884466385.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/14957437647.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/fexibipajelevunubanamuleg.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/34786284322.pdfIn PDF document text
    • http://wsm.hk/images/files/36430361881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+mobile+android+browserPDF 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_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 10688 bytes
SHA-256: 94344d4ba7c73934608e0dfd9ade5eda08a56c551f7694d4d5613a71622a11e1
font_01_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 16588 bytes
SHA-256: 6460ec81b1ffe98c4689951bc050006a01848ce338034f2ac1a5aceff6c101da
font_02_sfnt_off000121bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1