Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e91acb2b8e6aa0…

MALICIOUS

PDF

92.6 KB Created: 2021-09-13 10:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5ac08e12d620a73f15ebf63a5f5538bf SHA-1: d53ffc5d793b100ca36bb99d77b6a02cea566808 SHA-256: 48e91acb2b8e6aa0f6ec570837145819e846ba774225d57721de690915b5a08f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious intent, including random and disposable link farms pointing to other PDF files. The ML classifier and ClamAV detection strongly suggest maliciousness. The file likely serves as a lure to direct users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://zkmeiqi.com/admin/ckfinder/upfile/files/jazewidowonawepabuv.pdf In PDF document text
    • http://gartenmessebau.de/uploads/files/xesinozezixo.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/86286310664.pdfIn PDF document text
    • https://ewt.cz/res/file/81304333243.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca18f74420---ruparijujewidider.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/21828815992.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/69464273486.pdfIn PDF document text
    • https://deepex.hu/hirek/files/jebunadunawololupefu.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/20827515763.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/72318933904.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/tafuvovowerajulojawiwid.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/zadenirutiwupepujotew.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/82395704928.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/39979126553.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/57867364617.pdfIn PDF document text
    • http://elsped.hu/files/file/vatutajetilabixe.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/39203740485.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/925cdcbd71b67e09b4c2b95593c07753/82961399070.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/75643765970.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/pawujavijo.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109121414499553.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/fidevetepewi.pdfIn PDF document text
    • http://herve-coiffure.ci/files/vonalawamukosirafuledakul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=just+one+drop+loftis+quinnPDF 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_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB2 10568 bytes
SHA-256: c1b0c8a3c7385f7b32d30d95934a8cef6fb72a1998ba7f808a3c765b0e12fedf
font_02_sfnt_off000136b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B0 18168 bytes
SHA-256: c8cdab55b7d9a8cb45e01322b30d0d38a0f20abaf9ad2f3f34314bc7b15e0482