Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbef5fc3ce711746…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 04:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5962341a6e5080d244c74101c5e89a19 SHA-1: aced94a3d06b6cd8aeb23e02cf436d0113fe773d SHA-256: dbef5fc3ce71174620e5db0f9786c388e3e356e0c30ba2ba2bd595bd37bdb5dd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, indicating a likely attempt to redirect users to malicious content or download additional payloads. The presence of embedded JavaScript (T1059.007) is a strong indicator of malicious intent, often used to exploit vulnerabilities or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://djpress.pl/Image/files/wakide.pdf In PDF document text
    • https://femagnet.com/upload/edu/article/file/wavepomaxopedakudilan.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/gakepimidujujudupesu.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/kovaxagawedolo.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/24665461909.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/dokutifijajiliwulemixa.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/wakomevi.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/wexapubevaxaruwike.pdfIn PDF document text
    • https://motecx.com/images/file/buwasirebidisakov.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/dubelutiw.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/sunivavabesibeb.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/88018167217.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/mixemezakugopiso.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/004eca73cdeeae3373fcb21436ec03e2/61884954717.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/30363603185.pdfIn PDF document text
    • https://maria-galland.ru/files/file/fulonagufolisuguvigetaxix.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161331a6dbcdcd---limakuxaze.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/27788696301.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/34368994110.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/garutepa.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/89291408140.pdfIn PDF document text
    • http://hexindechem.com/upload/files/viloto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+add+a+shape+in+pdfPDF 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_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 10524 bytes
SHA-256: 8882bc4751266447b41ac604b88e0ea2a9558a80f866fdae0c2bd0c6de065664
font_01_sfnt_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 15932 bytes
SHA-256: 3c997b3204ead805b5876896ce1ff58b870a73c9ce4cb83eabc1a8f73060d7f7

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