Malicious PDF — malware analysis report

Static analysis result for SHA-256 d892e9377d047d6f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-08 19:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0aa2547ac39fe1d4eed02bebb3b05fc2 SHA-1: 27832c2f48696d3ec73086c71e7b1bb8af11171e SHA-256: d892e9377d047d6f47065b057666e7d2eceb25cd36cc203ced9a69eee045b0b7
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect the user to download further malicious content. The presence of embedded URLs and the PDF_RANDOM_URL_LINK heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soldearenales.com/galeria/files/zodujawetalomopidanugiton.pdf In PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/xokerazizaraxarefalus.pdfIn PDF document text
    • https://ghnservizi.com/file/92851278294.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/garowowa.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/file/regumimifuvob.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c35a9e89b---79242183308.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/padadobikezi.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/rorubixukawupejetisux.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16130036d8bd1b---dejorevidenapoxadofusex.pdfIn PDF document text
    • http://gibisch.com/files/files/kukoxijereluveseki.pdfIn PDF document text
    • http://teplospectr.ru/images/files/21442229810.pdfIn PDF document text
    • https://parfumzone.ro/files/file/tusebisosiradafopuzinibar.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/fixasolirif.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/pumorujatupaw.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/vuxuz.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16137c3fbafe45---24860788363.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/3611765335.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/bimegaxedelubirudubap.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/9637725935.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210903105746.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/24675712595.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/42323852799.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/23218306727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=modal+verbs+en+ingles+pdfPDF 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_off0000d0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A5 18760 bytes
SHA-256: a618d4a1efd66166d89ac72dfbb4a70775fe51ae9e6e5375654357371687b495
font_01_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 10772 bytes
SHA-256: cdb2d7b8d5bfb0180e9304704b48483727d41c52d08b9a40dfa8bf82480ffb31
font_02_sfnt_off000118d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1