Malicious PDF — malware analysis report

Static analysis result for SHA-256 67559ba805243d42…

MALICIOUS

PDF

84.5 KB Created: 2021-09-19 04:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4562879a50ec5d51a637a1580c9cce36 SHA-1: ad914a76d29eb63cc2551b58fb51177dc5caf6d0 SHA-256: 67559ba805243d42c1a5839c744371a9152ebe747f6ef236421e39eabd5c9cf0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to resemble file downloads. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nomylo.ru/uplcv?utm_term=android+1+dragon+city+mod PDF link annotation
    • https://fsbulletsandbrass.com/userfiles/files/3175484288.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/32014661357.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/18413859180.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/85948463013.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419adb30471---42235423175.pdfIn PDF document text
    • https://digicpictures.com/downloads/tukenegurenukezizi.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/ropetonosebufosuk.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/73782298907.pdfIn PDF document text
    • http://aprt1day.ru/file/69476122877.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/pimofalogutotaxij.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/voxanutapotikezusi.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/vafixojotalak.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/vupobuvopijexoku.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/55862359730.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/bakaz.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/4477516904.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/tufogutasanur.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/32221944188.pdfIn PDF document text
    • http://osiindia.org/ckfinder/userfiles/files/42776872299.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/vunatesima.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109091821348267.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/netepokededevokuk.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_off0000e6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 17992 bytes
SHA-256: 870e72ae9760e8e3873bb5888e36ef786b7350c7273cd8a067f09d0f34d422e1
font_02_sfnt_off00012cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 10512 bytes
SHA-256: 35ddb4e2d281bf1bcbc2710213d665f84a3cb108a391c63b45d34d0c4b4e1d2f

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