Malicious PDF — malware analysis report

Static analysis result for SHA-256 90455df9aa367c2c…

MALICIOUS

PDF

78.0 KB Created: 2021-03-29 05:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee5d06422c9c73a29632359ee40eb391 SHA-1: d4e701762a22f4392b069c64b7c8441e2b5a490d SHA-256: 90455df9aa367c2cc883033e8b5f16d7cdd451a15fb93408fa9f75f89dca962f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one critical heuristic identifying it as a link farm. The primary malicious URL identified is https://xezojetit.ru/strik. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=basic+english+module+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dumevurofif.rf.gd/cyberark_psm_installation_guide.pdf
    • https://uploads.strikinglycdn.com/files/f441d7c5-1dac-4a3e-a0d1-2c05785b3cf7/61774045213.pdf
    • https://s3.amazonaws.com/pusori/53487204405.pdf
    • https://uploads.strikinglycdn.com/files/3b670559-ca12-4363-a9fd-cdaeb7b8c9e6/fexadodaruwesuri.pdf
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_9ae4a1cb9426411b827c9f67b92ed94f.pdf?index=true
    • https://s3.amazonaws.com/tutapaxi/nelonemubo.pdf
    • https://s3.amazonaws.com/wujapu/92460578499.pdf
    • https://uploads.strikinglycdn.com/files/5fbfa16d-08ee-4251-a0ba-c161f4189408/33918076340.pdf
    • https://uploads.strikinglycdn.com/files/748da3ae-565b-44bf-bd5c-c66dd1957afe/subesawabisixodexekiba.pdf
    • https://uploads.strikinglycdn.com/files/df5c0b2f-ebb7-4bdd-8f59-5112f215bdc1/gonorovewab.pdf
    • http://poposumezaxek.rf.gd/ladies_size_guide_uk.pdf
    • https://uploads.strikinglycdn.com/files/ebc13a4b-7d50-4a89-9838-8b1ee5c35f6e/boy_scouts_store_memphis_tn.pdf
    • https://uploads.strikinglycdn.com/files/59606ad5-70b3-4b1d-ac79-ecb83cfb5121/22531018794.pdf
    • https://dcaf3b11-26f0-4e60-b842-01857b8e1462.filesusr.com/ugd/2df88f_dbe332ccc80d456c97e0bf97f2e20e1b.pdf?index=true
    • https://33b7cf8b-1cb2-46d9-9063-17e97cba5e80.filesusr.com/ugd/9edd50_ee234154a2ab4f7ab33a2db6e13f1423.pdf?index=true
    • https://s3.amazonaws.com/nasitevu/brookstone_big_shot_projector_remote.pdf
    • https://uploads.strikinglycdn.com/files/e3ce378d-f653-4391-9392-50c2f07def46/ruwobuvagafifusuvabesado.pdf
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_e33caaa00a234b17811ec1aace869855.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f274.bin
62250886b4d7a1b55c8b90206a43819a948adad088bae9ae5e7bbe4a232c2f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 5524 bytes
font_01_sfnt_off0001051c.bin
4cd1d84915339ea9f3e17328a5c45ff727de3befdf73d58ee6c53d594628eae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1051C 10732 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.