Malicious PDF — malware analysis report

Static analysis result for SHA-256 8633495dcf604e4b…

MALICIOUS

PDF

72.8 KB Created: 2021-03-22 17:52:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73b5364dd5918e7cbcba96e82aac91a4 SHA-1: 7feb3ebc71350590a7256ed48ace6e23a602c672 SHA-256: 8633495dcf604e4bd0fe527db3ec0f823190fc4c0966118be04b9a89b32272f9
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating a link farm designed to redirect users to potentially malicious websites. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an attempt to lead users to compromised or malicious content, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://golowaki.ru/wix?keyword=julian+pa+school+district
    • https://cdn.sqhk.co/jabosuve/ichac0l/34011901685.pdf
    • http://prizinsta24.online/41606844316bq6um.pdf
    • https://cdn.sqhk.co/xizaxulubezu/2Qcjgie/photo_slideshow_maker_with_music_and_text_online.pdf
    • http://cancandance.org/gender_congruence_and_life_satisfaction_scale9bzzg.pdf
    • https://cdn.sqhk.co/bixatavafut/U0xLOuD/31956970430.pdf
    • http://niwopofe.scienceontheweb.net/27226842697.pdf
    • http://makudejolas.iblogger.org/candidiasis_vajinal_sintomas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://daloketo.epizy.com/83975573191.pdf
    • https://s3.amazonaws.com/bopuxosavubare/duxivewo.pdf
    • https://s3.amazonaws.com/tisegovofu/excel_vba_set_range_value_to_string.pdf
    • https://s3.amazonaws.com/pisik/6898188625.pdf
    • http://nupuzawov.onlinewebshop.net/biosafety_cabinet_class_3.pdf
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_e7e0502ccb424baf8cf3bccbcece6b20.pdf?index=true
    • http://vibesiwag.epizy.com/fametukuvopaxidazilutu.pdf
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_e64dd7d081184a35823269c6e212830c.pdf?index=true
    • http://telusomabufa.onlinewebshop.net/72529139402.pdf
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_c0a94da873954498b6e1807e8dedb648.pdf?index=true
    • https://s3.amazonaws.com/jezobasit/vufok.pdf
    • https://43e3b293-20b6-4b74-9f7d-0eefffb4d2df.filesusr.com/ugd/11595e_4d06b088d0ff4be0b4e0668d2cc9a684.pdf?index=true
    • https://s3.amazonaws.com/wejuvono/28022700525.pdf
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_240211c253e24ab593a1eb86fdf95594.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_off0000dbd6.bin
692903ff22ddb4d92b9bb153d6a9bae4a0683778eea2a78afa8d19b65f0a9eaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD6 5152 bytes
font_01_sfnt_off0000ed54.bin
018581fc189e92f08372693df9601ea6a0048f682582dbbea703d8782853ad8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 11804 bytes

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