Malicious PDF — malware analysis report

Static analysis result for SHA-256 60499958fafd55cc…

MALICIOUS

PDF

72.9 KB Created: 2021-03-29 07:41:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bdba76fefc390f4a2330deb2e0465809 SHA-1: 33f515ee436d26b94032a2e092c72d50021ed695 SHA-256: 60499958fafd55cc557e57728513162b76f5233749a2c400e3f4b1e7cbb2ae6e
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a phishing attempt by ClamAV and ML classifiers. The document body, though heavily obfuscated, suggests a lure related to academic writing, likely to trick users into visiting the malicious URL. No scripts were extracted, but the presence of external URIs and the high confidence detection scores indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://pelibifir.ru/award?keyword=effective+academic+writing+1+pdf+download PDF link annotation
    • https://cdn.sqhk.co/disumuneriva/jdjdMia/nflx_stock_price_today.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/jhPUW4x/fafutidofodutizuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448345/normal_603a5f7814837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490736/normal_6045129a68a25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454679/normal_6007c644dcce3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529281/normal_603a25b539732.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378164/normal_5fcdc4106abb1.pdfIn PDF document text
    • https://cdn.sqhk.co/migixurej/yUigTBX/kodiak_bear_bites_nutrition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382189/normal_60388a01d2b6d.pdfIn PDF document text
    • https://cdn.sqhk.co/nakotuba/cBPhhZd/i_live_gold_edition.pdfIn PDF document text
    • http://logazajosoba.iblogger.org/zelorefipugorizigujuf.pdfIn PDF document text
    • http://degizame.iblogger.org/xovibutuda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea7f26b5-2eee-46dd-b96d-ec4ea372ffbe/5180837179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4109e192-b3da-4936-86f5-fec81283651b/wixuwe.pdfIn PDF document text
    • http://sesunofopum.epizy.com/mutem.pdfIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_4e41b839a5a94d659e16e6fa920f3705.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6344abcd-de1d-4f50-b9f3-86cf88c91f38/line_graph_worksheet_grade_10.pdfIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_eebfe85fda3d44bfa6905aa9d408c683.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3377430-6f18-4c4a-a626-61a8455402e4/apc_smart-ups_1500va_specifications.pdfIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_6d5fd1ab0f7c4f5ca9834b0e0e5525ab.pdf?index=trueIn PDF document text
    • http://kipixuge.epizy.com/mumen.pdfIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_976f766310fe457fb691c884b3d7cc4e.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_a33805dce4ab4e50a4c6a0b33dcb7f39.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 5460 bytes
SHA-256: 71826f76049497b49d3300c77c85d47bc5707c5c32e8e2e9aeac2d935c914470
font_01_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 12540 bytes
SHA-256: 2081fee880fc433ac8e36c2bc24ebba366210c723e6ed04fbb4880ff7867bbe4

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