Malicious PDF — malware analysis report

Static analysis result for SHA-256 61e8e41d7850d1bc…

MALICIOUS

PDF

75.0 KB Created: 2021-09-17 08:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fbed9b44949bddc4a584bbc3deab1c9c SHA-1: 9feeec0f61746949396fe6f9e243de20684f91c5 SHA-256: 61e8e41d7850d1bc541d439c4419c987f9a35e0f6c5bac010510bd4398c5c4f7
126 Risk Score

Malware Insights

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

The PDF document was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to external sites, with a significant number of these hosted on potentially disposable domains. This behaviour is consistent with phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vemifukaba.pdf In PDF document text
    • http://foto-preiss.at/upload_files/files/10669085385.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/12234589277.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/xovogalerikamud.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/66052712433.pdfIn PDF document text
    • http://zeci.nl/im/image/notot.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/wabopiv.pdfIn PDF document text
    • https://okazionche.com/files/6068944740.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/tipigenirugekutom.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/44908778138.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/newexag.pdfIn PDF document text
    • http://jar-ted.pl/file/zipurexatosoduwa.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/gulabiwekotemodesa.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d7bce9934e21e62881372c1c8da28431/jajikejobelit.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425405e10b8---fobaruxurefegolurubofepi.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/44849388100.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/51783825560.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/xomepef.pdfIn PDF document text
    • http://hevolta.com/upload/file/lawelovavanebebidokeruja.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/jotasipafiwegetigijeb.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/zutakekutizefabikukiboz.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/muwopeniwodubu.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/dekulimabavazuselabup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ott+navigator+iptv+premium+apk+crackedPDF 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_off0000be8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8E 10928 bytes
SHA-256: f088dede88c4f6267bac138c327fe272f4813dc5f7994f5f49685dd8cea546af
font_01_sfnt_off0000d7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B9 17784 bytes
SHA-256: d33b9e4e3e086ce121f2c55e1d0a54ea140f0f0867422dae62ad15aa843b4569
font_02_sfnt_off00010645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1