Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e97ffc0dcd2fb7…

MALICIOUS

PDF

82.2 KB Created: 2021-05-07 00:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52593e875be20e96d076eb077d6928d2 SHA-1: b0264b0a50bb3c0b8dc620518e141f492544ed4f SHA-256: a6e97ffc0dcd2fb7cc352481af3fc9cbc609a7fc70cbf9c940b10518b0a48053
136 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. Several suspicious URLs are present, including one pointing to 'securityofusersdevicesonline.site', which is flagged as a lure. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious content, likely for SEO spam or phishing purposes.

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://kuzutuzo.ru/strik?utm_term=how+to+reset+frozen+kindle+d00901
    • https://cdn.sqhk.co/diwewiduvaz/LHibuhe/rumble_on_reviews.pdf
    • http://idealslim-italiaofficial.site/agenda_fiscal_2019_descargar30uf6.pdf
    • http://dkmz3.club/method_maths_answers_june_2018_2hleh2s.pdf
    • http://securityofusersdevicesonline.site/intensified_algebra_1_volume_2_answeqjwjs.pdf
    • http://help-bluebadgecenter.com/is_visual_basic_obsolete1puuo.pdf
    • https://viweruvuwoloti.weebly.com/uploads/1/3/4/5/134577653/rukugedixalim-federurozibi-bubemururel.pdf
    • https://roturusuwanowus.weebly.com/uploads/1/3/4/3/134363773/453451.pdf
    • https://cdn.sqhk.co/vazodowadu/bEJgiaG/sikegudo.pdf
    • http://fimufajupasi.22web.org/metro_map_latest_2020.pdf
    • http://m-laskin.ru/how_to_learn_chinese_beginneracsuh.pdf
    • https://cdn.sqhk.co/baruduwege/jf0jjIP/24138591635.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/palevijuj/70331956309.pdf
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_fcfa2064c5b04221917c194c641e0d78.pdf?index=true
    • https://s3.amazonaws.com/gogoxowiniza/janetifuzulinenik.pdf
    • http://sidakofonol.epizy.com/35942138672.pdf
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_b09e4ccd0fd14e189b3584238a3f0992.pdf?index=true
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_743a12ded64b4871906c4b865e5d1276.pdf?index=true
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_be7081b3a86e439a925937fd502993a3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a8.bin
a8f21baf9b31aa73e60109059c09d8a449b9d5c9df495c38388283366756da62		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A8 4248 bytes
font_01_sfnt_off00010495.bin
a6a692992dc651aebb5e665f349fb52bfd8805af3cbf15ac543c6805957cde3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 5208 bytes
font_02_sfnt_off00011679.bin
b372bd40c6d50f774b364534934638b08533da25f6d13dabbdd25b7d3c9e3631		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11679 10824 bytes

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