Malicious PDF — malware analysis report

Static analysis result for SHA-256 d913f67ecf871a19…

MALICIOUS

PDF

82.8 KB Created: 2021-10-14 20:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e3aa10f462d4a7d84c37c48162ea27ad SHA-1: 6ad87caa879f02d2affd6855efa7f7859c490852 SHA-256: d913f67ecf871a192991b8fce326f23e9b398dba7a43e6ddab10aa21f075290b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or are part of a link farm, indicating a likely phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to redirect users to various external sites.

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://pixomot.ru/uplcv?utm_term=how+to+block+text+messages+from+unknown+numbers PDF link annotation
    • http://hyunshin.net/userfiles/file/80592324165.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f448ddb7c7---62437198809.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/wazilevom.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/13090190095.pdfIn PDF document text
    • https://cet.sk/res/file/rawinedamabekolakar.pdfIn PDF document text
    • http://tercovci.cz/files/file/46893135254.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/11634639570.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210921154824.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/zalulekutomulufazuviwi.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/f25728f722715c44bd5da32081d312fe.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/64947169229.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/25572671637.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/29145772142.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/42736406486.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/mibuvixebozexuneperavexon.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210928_8FB61ACD187C2190.pdfIn PDF document text
    • https://amityhr.com/userfiles/file/gorototetazide.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/99127906965.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/bbe7e9a327fa4063041c9d835abfff6c/964389070.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/12739460884.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/90766499271.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/zewuxexibakusoru.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/61954695881.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/30893138239.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/konerukuvegazaziduse.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_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 11100 bytes
SHA-256: 8a19005a44e1497c5b082410c68e0419dbfdaab2744b5180b6398bb523faf4b0
font_01_sfnt_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 18716 bytes
SHA-256: 289bbf6ad72664a430a737c45c5de92990e7518c82b322169cccc9f311d707c6
font_02_sfnt_off00012553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1