Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d28a70425be234…

MALICIOUS

PDF

78.3 KB Created: 2021-04-07 00:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ada17a79ab3218ae9207a19d5c6c79ad SHA-1: 45c242952a6ac1d087a6cc28d525aa525176eceb SHA-256: 79d28a70425be2341d3be2bec6da7653aa958d6b2245721eb50beb430d9304fd
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and a 'download' button lure further support a malicious document delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/award?keyword=uptet+2020+answer+key+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417519/normal_601151b490983.pdfIn PDF document text
    • https://fenazimo.weebly.com/uploads/1/3/4/4/134437137/62d00a7c4b91.pdfIn PDF document text
    • https://jikurufor.weebly.com/uploads/1/3/4/6/134613562/9ceb2206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420761/normal_606765b44e61c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394072/normal_60394e7ed5ed3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465557/normal_60633c727b248.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/99108701382.pdfIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_5090125c53e04266accc7263ef7a82fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/61479688986.pdfIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_1d5e2a9109404885955fb1e5398ee0d1.pdf?index=trueIn PDF document text
    • http://luvubarebefu.rf.gd/birthday_invitations_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/cen_cenelec_guide_11.pdfIn PDF document text
    • http://gowobubovojot.epizy.com/anpanman_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/certificate_frame_borders_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/ziwekigabebagepolapu.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/niretusezokutikorog.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/used_mini_dv_camcorder_for_sale.pdfIn PDF document text
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_52f492fa708546feb8f075e3851f8093.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B6 5560 bytes
SHA-256: 0b852db04505d1caec3675cf98f16b1089d95d8ae919e87025f51eda7a1691ff
font_01_sfnt_off0000fbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC7 2248 bytes
SHA-256: 8b88185fb1caa19b127db774f1e773b8ec41d1394bc7b72cd727186061f48d9d
font_02_sfnt_off0001061a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 11076 bytes
SHA-256: 3d224fa7a9c114b0771d057298f53ca36700c4974bc9bacf8aed51f643fd9863

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