Malicious PDF — malware analysis report

Static analysis result for SHA-256 6548538968c693be…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 09:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 330fce552d4fbec99932907ec4a52bdf SHA-1: 76fe6bb2ff565f08463077c23b10ab3c59b7cfda SHA-256: 6548538968c693be51f66d19b292950dada1ca3e494b7cef0e1c280cb5bb4b95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to distribute malicious content or phish users. The file's metadata indicates it was generated by wkhtmltopdf, a tool often abused for creating malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=how+to+shut+down+galaxy+tab+s6+lite PDF link annotation
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/kukegenuroxewuxinexuto.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf06576dd---durazidonasikuk.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/dizun.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/memalawi.pdfIn PDF document text
    • http://cpviettin.com/upload/files/kufuxoporanotosanofule.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/pikanidajufadepowat.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/navozenajunagupinogusolu.pdfIn PDF document text
    • http://findacommodity.com/upload/file/radebakobefigarur.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/85810515400.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/katapa.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/6464664634.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/6257797212.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/89372971476.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136a856410ff---93113991088.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/nuzuxidojusuxepafa.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/10839486071.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/97828003347.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/18462187697.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65609542063.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/fipiv.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/1120630807.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/wisusazeto.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/35810128249.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/54103010299.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_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 17288 bytes
SHA-256: 7a670868fa2bf76abc3c448e7717ae2908e15355e63f7a214cea122d2440ae15
font_01_sfnt_off00010a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12286 11128 bytes
SHA-256: e80e20b83ab601048bc6134159dfe7f266fbb0b77a3a0675dd3599a570ab3d5e