Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc8e4a78076f073…

MALICIOUS

PDF

74.1 KB Created: 2021-03-14 16:32:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42aebfaf66ce9b1ba1805b76d0784fe5 SHA-1: 99f1d3e35a2368cf66d5a43590e0b4d9d1f31e02 SHA-256: 2dc8e4a78076f073a2dbcb86c25901557649e818e63b86c107c46056d7c00f05
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with the primary URL being 'https://bologen.ru/wix?keyword=epiphone+ea-250+serial+number'. This suggests an attempt to direct users to potentially malicious websites for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=epiphone+ea-250+serial+number
    • http://profoto22.ru/58953132639gzhlw.pdf
    • http://lolebunefa.iblogger.org/simple_present_past_future_tense_worksheets_with_answers.pdf
    • http://meetchat.space/30734436614o2s74.pdf
    • https://cdn.sqhk.co/jirudumom/ijzhcTB/rebirth_movie_review.pdf
    • http://taygerr.com/gujedqtfke.pdf
    • http://idealslimitalia-official.site/combining_like_terms_practice_sheetza9rv.pdf
    • https://cdn.sqhk.co/keragipiki/oIAoghB/call_of_duty_companion_app_for_pc.pdf
    • https://cdn.sqhk.co/zolokike/DghNzjf/tamapefef.pdf
    • https://cdn.sqhk.co/sesijisova/gjiehf1/66655098561.pdf
    • https://cdn.sqhk.co/gusisitixinu/bihigfQ/abound_crossword_answer.pdf
    • http://zootime.store/questoes_administrao_geral_e_publicaogs7m.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c9101718-0e1b-484f-bce9-2e86f929840f/will_cyberpunk_2077_have_mods.pdf
    • http://sipofepusadofas.rf.gd/70617140165.pdf
    • https://uploads.strikinglycdn.com/files/05b83329-b5df-4434-8360-bdca02b65a4a/37702322617.pdf
    • https://uploads.strikinglycdn.com/files/5ede013c-f7a4-47ce-a14d-c00e7becaa30/pre_calculus_12_textbook_answer_key.pdf
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_843a19e11bc44f22a1566993e89ca8ff.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9afc5bb6-ace6-4e6e-9c17-09e1e45d581f/42738433556.pdf
    • https://uploads.strikinglycdn.com/files/500d839d-c767-4bdd-a447-7a2727fd8d41/6918893117.pdf
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_2857296dcb114399b6f676025f34cbb1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9adbb6a2-484a-4c69-ad16-cf31b2254d60/88163764314.pdf
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_5fbc76affb164aa89bf682a12cfa9016.pdf?index=true
    • https://uploads.strikinglycdn.com/files/82653d1c-0049-4fe3-ab2c-6c4ff9dea649/tipos_de_sistemas_del_cuerpo_humano.pdf
    • http://kakedujeruvos.epizy.com/28323333089.pdf
    • 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_off0000e378.bin
d22dd02bcd634dd931c7bcdc2f756b31d3a3aeec39bd1db9cb13e4e08cd704cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 5588 bytes
font_01_sfnt_off0000f650.bin
b823f9c8a1c952be8577af36a84b5d2473b1fda2420bfaed99acb7c014b4e54d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 10764 bytes

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