Malicious PDF — malware analysis report

Static analysis result for SHA-256 df98993a772dcb55…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 03:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2036994db53d21a9a15f95bbd67a1cd SHA-1: fc4b57d737d7db48a0d0b868f411e6276c383795 SHA-256: df98993a772dcb550109bf3cac463c5768b1e185a5969b0c39a38f8080833d53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting an attempt to distribute malicious content or phish for credentials. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://queure.ru/uplcv?utm_term=esl+pronunciation+worksheets+pdf PDF link annotation
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/tomalikapenonafu.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/kujajamivapewupugifutafo.pdfIn PDF document text
    • http://maha.tcnme.com/chop/multimedia/userfiles/file/fewekux.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/razebaxi.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/dazix.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/tovasadofafowarewev.pdfIn PDF document text
    • http://someteme.com/archivos/_20210919231108.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/dobagaxajikejulaputamo.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/fajibug.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/69749750484.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/xoxokipiwowimax.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72976683138.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/5938710747.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/22556961629.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141e5c537962---33174329479.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/51925680659.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b14bbc846---72551254637.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/99382575897.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/ziluwixepun.pdfIn PDF document text
    • https://polaria.cz/images/file/vixidovikomuno.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/nulan.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/titosesasulibitozu.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_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 18104 bytes
SHA-256: 2213836f0046c1e18fa57e5c514694be78cccff8168b30beeaa5caa7eda58901
font_01_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 10980 bytes
SHA-256: c221406e280d05cda58f6aa1c7e54917ba480f18dc97dcedccd26043f7bbdad5
font_02_sfnt_off0001276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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