Malicious PDF — malware analysis report

Static analysis result for SHA-256 0efcbdabd9525811…

MALICIOUS

PDF

110.7 KB Created: 2021-04-04 01:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 7a5b8576f5d85f8044dc0df5837bb1b5 SHA-1: 27ae9ea80c18a18a646ab30544ef55fed15df380 SHA-256: 0efcbdabd9525811dd3af7292853b4455e47a8407b49016ef1d4015c585229dd
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link leading to a suspicious domain that appears to be part of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://baarspo.ru/award?keyword=akreditasi+puskesmas+bab+7+pdf PDF link annotation
    • http://vakexuk.22web.org/channa_mereya_ninja_movie.pdfIn PDF document text
    • http://mutinujevax.22web.org/22678177810.pdfIn PDF document text
    • https://cdn.sqhk.co/bipuzojafa/gjgeE7F/masutufetotekusobiz.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/djYge1P/fox_sports_directv_channel_world_cup.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/iehahdn/zogegolomuz.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/dinisemowoge/pinonixunivaz.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/codeigniter_user_guide_helper.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/employee_mentoring_program_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/66827741909.pdfIn PDF document text
    • http://dufexisoji.rf.gd/cancer_de_prostata_scielo.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/time_attendance_report_sample.pdfIn PDF document text
    • https://78ee58ad-4251-4cb6-9d9e-6f806931ac90.filesusr.com/ugd/b6b4e8_71f729737fa545399ea59508634904e0.pdf?index=trueIn PDF document text
    • https://9cc03a5b-da86-4a44-8f3d-15f7580f9586.filesusr.com/ugd/cac91c_eb7101ba4ca942dfb19af1c12e452255.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/resoroloxusito.pdfIn PDF document text
    • https://79f67b98-100a-41ac-8a2f-4880133f117e.filesusr.com/ugd/f12c90_c976ff916e6d47ceb04d3c5a1b4e0ab7.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_cd0702c6e5bc4c83b454e3e700b05c40.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/lometesomurusub.pdfIn PDF document text
    • http://suzoduw.rf.gd/95511597581.pdfIn 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
    • 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_off00015f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F67 5428 bytes
SHA-256: 2fff39936eec71483ba834424431ff51286cf859bb1b73cb736397bce17f01de
font_01_sfnt_off000171d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171D1 10332 bytes
SHA-256: ae9bcfaff3d247e25f7e34ad2c4f5ba06a6840c6f2a5130d4fd8ced559a7b75b
font_02_sfnt_off0001952f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1952F 16644 bytes
SHA-256: 278baa1b11756d8c4a3b4f0ea311797a461623b658957d866c583f44111f09d0

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