Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1609b127f7436c0…

MALICIOUS

PDF

85.1 KB Created: 2021-09-14 09:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fddb20b263eb66a952aecb19c825f791 SHA-1: 759b0ed1668fe4efd55cfc8acc0fe79fdc32db81 SHA-256: d1609b127f7436c03db5eb3c711551fb237ecc14aae1002ab59b034e71deb0f9
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to potentially disposable hosting, suggests a link farm or phishing lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques commonly used for distributing malware or conducting phishing campaigns via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://aqualibramontois.be/fckdownload/file/83208418031.pdf In PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/wiludumuveze.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/taxagojefikokufogupomewip.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/40215207817.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/fufevimogotif.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/81777174034.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/073f197ea495080d1e991390871886bb/80456333639.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/48352354140.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/47656303518.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/renalifuxusesumadevefa.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/39665966048.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/pajemol.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/zidujuxuloragafitafogiz.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/12925504305.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/15240261093.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/3658741656.pdfIn PDF document text
    • http://meskerjager.nl/media/files/notamokowigazogefeneledo.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/5711672313.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/10397282890.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/makumudowubigalelibosevis.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/27775718927.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/betor.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/57936753402.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/24959513937.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/zafula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=minecraft+pe+mod+apk+latest+versionPDF 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_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 18108 bytes
SHA-256: 2cd1e8c5ef145af51f25f44338a2011961169a3fc33c1aeaf5fc278cb9bf9e26
font_01_sfnt_off00011570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D87 10932 bytes
SHA-256: 9ac84dca11ef148783e2ee7b4ea8009ade7c93bd14f7884f777d0bae22b072cb