Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0be783fc7a8a42f…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 12:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7933f3a986ebaac5932f3b55e935f180 SHA-1: 0d087c200f5c298140d6e3a701971299b358f54f SHA-256: d0be783fc7a8a42ff06234d56505764f25306c308e76137225bce9deec6de39f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files hosted on various domains, indicating a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure the final malicious destination or to distribute multiple malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://sporteambiente.it/ckfinder/userfiles/files/dedupafiw.pdf In PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/gepadanote.pdfIn PDF document text
    • http://onelove.cz/file/41615197560.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/xabafuj.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210905095905.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/bezuxawiraxijezi.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/15744814538.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/16870150933.pdfIn PDF document text
    • https://ksboutlet.com/file/files/95058875961.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/35118170830.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf57b01dd4---gunuludovekemidajemukivan.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/samigalalirupalasikase.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/notoveritixujozig.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/82367608667.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/43455594407.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///90693450110.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3c6f26682acd9c03bececac8a0b1123f/vamefaromasizirobajos.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/92101523570.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/29177238817.pdfIn PDF document text
    • http://reopen911.info/media/file/98682486518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=idm+new+version+with+crackPDF 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_off0000afe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE1 10784 bytes
SHA-256: 1a7742fca8157e667f75b303306610e611d2d8f150dac4e12f5cdc8d022028f4
font_01_sfnt_off0000c89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 16440 bytes
SHA-256: 93f6edd9a8c96e8772352968326e4279d2a85ba8944ca0555fa0cfb0d6052ec5

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