Malicious PDF — malware analysis report

Static analysis result for SHA-256 07551da884ae8446…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 02:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8be6df8753ee4d92e0e7c27e90729d43 SHA-1: 8a9ac72fed1b039a16f8b39930b4ac77c7ee4bc2 SHA-256: 07551da884ae84461f4ac735a37a3df5ced3cc67b63438c499c70627eef1fcbf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a large number of links on disposable hosting, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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 https://gamepinleri.net/calisma2/files/uploads/25435694995.pdf In PDF document text
    • http://skomi.ru/img/files/file/6431381852.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/meluzexekunakasepimino.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/50379853843.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/kajefupuvuku.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/vorib.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/14322443689.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614491793e5b0---vawegib.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/mutunujoradakuv.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210914_EBF202D29C3749A0.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/vipupuvisojiwenulolatu.pdfIn PDF document text
    • https://badrivishal.com/media/58641492811.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/97331768466.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147c477e0a72---89314122093.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/nozorij.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/21822467530.pdfIn PDF document text
    • http://space-edge.com/upload/files/xumuj.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/radabo.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/50000942805.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/mogilidozosu.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/76496839989.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/wijokin.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/wexobiwumexiximul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=top+5+mobile+osPDF 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_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 10188 bytes
SHA-256: 46d5f1a99bb5463c09b78c9e6651085577d42710159ba974c3dc888052e8d63d
font_01_sfnt_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D9 18272 bytes
SHA-256: e06b09189fd9b03b13e8f0ed4bea3542ec624e80234706f20baa945f0862f96d

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