Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4d45a46e4eed54…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 06:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9707c1f505ac91497c5fa8da995de7b9 SHA-1: 09600b27dee3b8906795c4f2014e94737c0728a4 SHA-256: ee4d45a46e4eed54cec84e464ce42111740437ddbc1b13e45c906c013addd68c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable domains, likely intended to lure users to malicious content. The document body is unreadable, suggesting obfuscation or a focus on embedded links rather than visible text.

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://kenadong.com/contents/files/37055055451.pdf In PDF document text
    • https://hunghiephuylog.com/upload/files/99924570108.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/71965259123.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/nijekatojugez.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354636ea0bb---zatazomobomovupilodesuni.pdfIn PDF document text
    • http://airmon.hu/images/files/17881710376.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/bafuzap.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/39794491649.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/73582561402.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/37308049252.pdfIn PDF document text
    • http://portableandcool.com/files/files/bufosinegomip.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/sakedesipawojibu.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/29180492870.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/menibizekonakaloweju.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/fosunonogolatulitopop.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/lesawebogera.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/63441107906.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/fuwefelefivutefokifewisi.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/74977670763.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/3822998431.pdfIn PDF document text
    • http://status.cz/UserFiles/File/fovanobifedijupanowi.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/zajudogigemot.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3e6f79b048d23b1ea1aa0cb06a28126c/sodujoposi.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/16956197004.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/83865925491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+add+widgets+to+androidPDF 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_off0000db51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB51 18112 bytes
SHA-256: 202f15c050d04add11b9f4a53b5981ca0dd8cdafd09a3b79b9d5a0bccf7ffd29
font_01_sfnt_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001226b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226B 10456 bytes
SHA-256: 2090f65299c18f3a6ea0476dcfa0058aae7948ca465c2957c218e33386c681c7

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