Malicious PDF — malware analysis report

Static analysis result for SHA-256 d813594a2031420f…

MALICIOUS

PDF

70.9 KB Created: 2021-09-17 08:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f110868611bdb34979212a177b476bf7 SHA-1: 15192ecc9aa759c29ae201800276b1ab392f3f9d SHA-256: d813594a2031420fc2797c7502eee62e771bb12ab1971dd387e625acdea8b6be
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. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/wimomenan.pdf In PDF document text
    • http://prodottoitalia.eu/userfiles/files/73888444831.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/35301672246.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/54171380326.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/80922244788.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/916ac866a731bc56b723b143138c5703/zuzumakamuvowunemagadade.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/zanitarajoxosinuwile.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/4351442861.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/xinedesenunos.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/tirobalokazisa.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/wibusovaxojori.pdfIn PDF document text
    • http://identik.hu/editor_up/77549540401.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/likejezaludomuxod.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/nevizuzinuxukoxesumi.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/12167259808.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/fukesizojolalumuvunamu.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/42313949444.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/59939445260.pdfIn PDF document text
    • https://dacola.com/upload/files/52701659062.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/3431942410.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/bifozapuzevarotoxijudi.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/wunuwelogalud.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/duvolimudesugiv.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/41665079341.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/2353820433.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/zegiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hide+calculator+apk+downloadPDF 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_off0000b468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB468 16416 bytes
SHA-256: d2a1ceb1eec8a65f5910c18455f592606affa50aa3ef25dd4a668f7709148358
font_01_sfnt_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 10608 bytes
SHA-256: 379238f5f7ea577395ab7802f8d2acec167cf6db0b404032bc41a092022abfa0