Malicious PDF — malware analysis report

Static analysis result for SHA-256 6284823c4ca2dcfe…

MALICIOUS

PDF

76.7 KB Created: 2021-04-27 18:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e5b1f5db5f68617961450f3162c0d92 SHA-1: 6ed63192d03ab56be417d589d12143af3b16a2fe SHA-256: 6284823c4ca2dcfe9028ac2aab08b24f0742ca96e6438d49a8d1235c6c766b0f
164 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. The presence of a 'download' button lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=embedded+commands+seduction
    • https://cdn.sqhk.co/toxinize/ifih7he/monaraxapepelizunam.pdf
    • https://cdn.sqhk.co/sadamire/orjdghr/34100625798.pdf
    • https://cdn.sqhk.co/rogevuzazi/6XhfBih/61793500513.pdf
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.pdf
    • https://cdn.sqhk.co/niminililez/Pwggajd/dejunikarolinub.pdf
    • http://rijexofugovu.medianewsonline.com/what_are_reactive_strategies_in_aba.pdf
    • https://cdn.sqhk.co/fakomuse/hjgfZij/snakes_and_ladders_spin_master.pdf
    • https://cdn.sqhk.co/gobejilu/ahgjihL/lyrical_video_maker_app_free_download.pdf
    • https://cdn.sqhk.co/businaxidare/jfhedhg/78534380417.pdf
    • https://cdn.sqhk.co/jabosuve/fhhRYjh/36096958123.pdf
    • http://dodemul.mygamesonline.org/7042227601.pdf
    • http://reveruverof.medianewsonline.com/how_much_did_stuff_cost_in_1980.pdf
    • http://jatudoz.getenjoyment.net/basic_automotive_repair.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_66543497a29149d0adc3514fa52c3023.pdf?index=true
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_5008a41c3adc4b3791a732b612928f5b.pdf?index=true
    • https://a0a5ada1-270c-452f-b092-d943fc6f0dc0.filesusr.com/ugd/306762_35c67ca996984cff92d28cc8fb9ee350.pdf?index=true
    • https://s3.amazonaws.com/gozilum/teachers_day_speech_in_tamil.pdf
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_69e409629fba4315a8188a0b0ae6e817.pdf?index=true
    • https://s3.amazonaws.com/meludav/22352746151.pdf
    • https://s3.amazonaws.com/sitozi/wewotusekapafokako.pdf
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_ea8fac823f0e42f5ad1c773f3fc91540.pdf?index=true
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_26adac21fc6d4f3f9b421197b624d232.pdf?index=true
    • https://s3.amazonaws.com/dovulavavo/23348709623.pdf
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_207b80b4710044f681ff4fcc8ae1c0e6.pdf?index=true
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_70a7fae3e6b04739ac1dcf215a28e5e1.pdf?index=true
    • https://s3.amazonaws.com/padadutiseni/aapl_earnings_report_time.pdf
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_83752eed37eb4dda8be8dbceb041e638.pdf?index=true
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_bf50823135064b5596589b6666517278.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_off0000eed8.bin
55f4d99735cd504fb88ea3fd94cc09630fd91eba760e1550d1f025bf0d81a37d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED8 5056 bytes
font_01_sfnt_off0000fff3.bin
c024e8cffd6fa401204d2a7b3bca9277ed6299d81127eaea992d07689b1b13b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF3 10432 bytes

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