Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bfce66850ac1b2…

MALICIOUS

PDF

72.2 KB Created: 2021-09-24 05:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7854d6af4202d73494a456720246483 SHA-1: 8d774085d98c26db358e850fd55474aa014cebc7 SHA-256: 57bfce66850ac1b201a016d6c184041dd4ffd6bdb5cd3cacbf4f70df49c7f116
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The presence of multiple links, including one pointing to an IP address, suggests a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate it's used to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=ejercicios+resueltos+de+integrales+indefinidas+pdf PDF link annotation
    • http://nujhimachal.in/img/uploads/files/bavekunamuturofupez.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/jikuzekawunajedolopu.pdfPDF link annotation
    • http://lasermedia.cn/userfiles/file/65445700543.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/10196445839.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/20267746903.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/64873067571.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16308604579422.pdfIn PDF document text
    • http://midel.me/userfiles/file/6906931234.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141578785430---muliriz.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/65659131171.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vovawijugamob.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/zudatafegezu.pdfIn PDF document text
    • http://punaide.com/userfiles/files/69334621830.pdfIn PDF document text
    • http://seamacros.com/upload/file/wunelajinebudawemuxof.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/6948098958.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/61036951471.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/gosisinudafobafodor.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa5beb37fe---zusumu.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/segutaxijuli.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/munekafezataxaz.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/19348104750.pdfIn PDF document text
    • http://vkts.se/userfiles/file/togulolupumem.pdfIn PDF document text
    • http://oris-am.com/editor_up/86751755806.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_off0000b60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE20 17296 bytes
SHA-256: 1cde7b20bd1d74a79e241d970e30621a9080ee408bafef68f09195eaccece530
font_02_sfnt_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 11008 bytes
SHA-256: 45c61a2d2eb7450e8e6f97c3c674e448ca3bb971d0cb24408084a6a9909014a7