Malicious PDF — malware analysis report

Static analysis result for SHA-256 016077d98df821eb…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 13:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e309e2db92ed72eac34de5bfd4b4943a SHA-1: 72dc7a2a5179ac49922298555bdc9f565f8b392b SHA-256: 016077d98df821eb6a4efe5b7136dbeca73aa426c28f211b2fe1347d8268fe68
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to potentially malicious domains, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may exploit vulnerabilities or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://rcsiprojectracker.com/userfiles/files/rulumusuwulosixapuko.pdf In PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/57072163818.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/26276754035.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/rewaz.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/78918865818.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109110357578424.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/40302229385.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/161c2aad1b370018b370db51d167503c/mubowitisenuzowogazukidok.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/zejosumotodekedunabifuxo.pdfIn PDF document text
    • https://olterus.com/contents/files/duwepufezugeworapav.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/97529728946.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/xijogov.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/40763762825.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/16393913645.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xogubesorikaralas.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/50944463687.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/86151952431.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/37481361882.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/rupibixu.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/nirufibajuveg.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/56139731626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=intouch+app+for+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_off0000e57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 17904 bytes
SHA-256: cc96c9c43e13a38b475497a9fd0a9a01f907f24bc47eb1265f78e54181c2c7dd
font_02_sfnt_off00012c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C32 10420 bytes
SHA-256: 0ceebc9396cfb92b25d3788c041289ce37f9a9670516ae755961fdf3925f92f9

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