Malicious PDF — malware analysis report

Static analysis result for SHA-256 427a6bda7e26f2b3…

MALICIOUS

PDF

87.0 KB Created: 2021-09-16 12:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d56c223c86cc141f4aae0fbffba46c9 SHA-1: ac2eb5f578799cddf495883270c45fce6109fb25 SHA-256: 427a6bda7e26f2b36242d72b628766a051e23ca1aab9eb776d30b4db73c670de
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mislenyiallatorvos.hu/userfiles/file/58218314781.pdf In PDF document text
    • https://affordans.com/ckfinder/userfiles/files/sikorigomotavigo.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/ximogusasat.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/60935764806.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/88239283849.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/17094001202.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/zekasutujowidokuz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138a333ccb---givagafuzadejip.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/punirabanojafosotexifedu.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/2895745564.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/xugapodofuzoras.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/binakaxulepusazusuwagujoz.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/xowomufapu.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/82866389579.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/tesaminanabuxowi.pdfIn PDF document text
    • https://brs.jo/userfiles/files/vifupatoxeranilomuxiji.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/81358453420.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/8110453114.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/10398490864.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/48029764663.pdfIn PDF document text
    • http://balone.net/_upload/file///zanevedunirubates.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/50593900130.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/vogilufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ph%E1%BA%A7n+m%E1%BB%81m+gh%C3%A9p+nh%E1%BA%A1c+v%C3%A0o+video+cho+androidPDF 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_off0000e2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BD 28368 bytes
SHA-256: 56a2034a76e1413ffdc319411bbc79abddcf0b6f202b76fa4eb76750a2ca6395
font_01_sfnt_off00011a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001324a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324A 11656 bytes
SHA-256: 8713747f22d979d2dd4f2e88fc1cd59f5db04a5e72bf6732ec52b8e4408e74ff