Malicious PDF — malware analysis report

Static analysis result for SHA-256 777538b7cc1238f1…

MALICIOUS

PDF

77.2 KB Created: 2021-09-20 03:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8f056d393ed5af2d6e4fdf596f4100a SHA-1: 21d38c4955bbbddda8ab4c27bbcd88153ba88cec SHA-256: 777538b7cc1238f16f13c7adc357aae1a0615a5738dc9660aa76acdf7a4672cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm PDF, with numerous embedded URIs pointing to external websites. The presence of these links suggests the document is designed to redirect users to potentially harmful sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=new+cartoon+movies+apk+download PDF link annotation
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28318291568.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/molowiwawilegimi.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/82282874618.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/ditepevasadiwoxis.pdfIn PDF document text
    • http://thevalleytrader.com/files/78544418884.pdfIn PDF document text
    • https://castel.ro/userfiles/file/bokefibixebexa.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/gilidagowotiruli.pdfIn PDF document text
    • http://stevis.cz/files/file/17136774169.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/35403925254.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/wakovib.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f31b5e91a8---beguzowipelesagogiwipu.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/99683787845.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/49054366381.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/motexetajijuwogodogoj.pdfIn PDF document text
    • http://doanandieuduong295doson.vn/namthuan/images/news/files/24265614787.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/53779423991.pdfIn PDF document text
    • http://cssh.es/img/file/98511373120.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/bilasazazevebavajinanugu.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/22910203146.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/luxofebopopora.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/25463917326.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/vilup.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614192b921141---3377730090.pdfIn PDF document text
    • 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_off0000c7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E6 10896 bytes
SHA-256: 1d99ed5f00351ae4f6e26763dbc10eac31ffe7fcf8f5ecdc2792f92691ddfc13
font_01_sfnt_off0000e12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12B 17808 bytes
SHA-256: 3372144f5fe9965da56b6dcea2d45ce2f4bc4d5b3d70e8368e3df75105ffb8b2
font_02_sfnt_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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