Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59ba23ecd588852…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 19:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae11dfe69022c46ed94c008b04a6e9b5 SHA-1: b1fbb95abca159f60190456272002ed8a7604cf6 SHA-256: f59ba23ecd588852f6a14f87e147663041d6157b1a9e7357cbb30f946f0c588c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://gysanya.com/upload/file/210911231246861662j8upur1kylxf.pdf In PDF document text
    • http://mesterteto.hu/userfiles/file/gonefizezubazivodop.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/27830695799.pdfIn PDF document text
    • https://masukpt1.com/contents/files/81725821449.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/2116184103.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/19107408277.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/73469209305.pdfIn PDF document text
    • https://istanajp.net/contents/files/rixopimuxanefiwewudi.pdfIn PDF document text
    • https://businesslife.com/content/files/zubulilokafesoxelomen.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/budalux.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/77591451259.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/54410463539.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/27598418803.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/54430190780.pdfIn PDF document text
    • http://104408017.linker.tw/files/juposuwutajevaponigo.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/8590322533.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/pozizisenenil.pdfIn PDF document text
    • https://riwg.in/userfiles/file/39598217222.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/tojufiwivaparanopopek.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/junaditukinorolofifumuluz.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab01a2056f---pusaja.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/99650707873.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/62136483154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+caldav+clientPDF 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_off0000d6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CC 18684 bytes
SHA-256: 5535a3118cb8660c5df1469fbfa547e3386e1f0c202d138cd205fd0dfd6c96e6
font_01_sfnt_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 10244 bytes
SHA-256: 79276984b0ca89f9513716353c9801ffa923847196be908ba953f4da0a3a48a2
font_02_sfnt_off00011f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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