Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf67dcce250bae03…

MALICIOUS

PDF

86.8 KB Created: 2021-03-14 00:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2a814a3335fbed3ee0febafc0ef2b79f SHA-1: f73712b5fa207c47759276fdcc836b9c7e7dd196 SHA-256: cf67dcce250bae030b8ecf07a14dae8ee948343e3fd539138aab11a15d3188dd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically a phishing or trojan payload. The embedded URLs are likely used to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=lista+de+verbos+irregulares+en+espa%25C3%25B1ol+conjugados+pdf PDF link annotation
    • https://cdn.sqhk.co/rekosiseweno/JRGgcWE/international_days_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xinefegepe/ifjggWN/teachers_credit_union_customer_service.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/ps_vita_low_price_in_india.pdfIn PDF document text
    • http://tricitysikhs.com/549481894709kbic.pdfIn PDF document text
    • http://hotel-engels.ru/jumexisewipckblk.pdfIn PDF document text
    • http://premial.su/zarufikalujugazorurmmgd0.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/ike0jho/space_wars_game_1962.pdfIn PDF document text
    • http://cafechorsu.ru/bikerakariw6aa4i.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/inteligencias_multiples_que_significa.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/jonathan_livingston_seagull.pdfIn PDF document text
    • http://topafigo.mypressonline.com/43406400682.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/wusigipufuvowix/measurement_conversion_math_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/widupinajomotozet.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_778cd1a6ff78465ba5183d0f6c1dad0f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wezukep/cheap_platform_sandals_near_me.pdfIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_4cbb54b3dc544420b5fa2d7da24ba6ff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gudukupir/pronouns_worksheets_for_esl_learners.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/47873592673.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/35385817034.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/two_column_spreadsheet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/731269352.pdfIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_71bf93cab98247f7be328e335db98fa6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/kamanu.pdfIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_3bb7bb3c40b244f49359a2e00840ffc8.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10A 5752 bytes
SHA-256: eb277ccf1458b25063471774cc74b5249642696109cefa017c577e7a93cdefe5
font_01_sfnt_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 1956 bytes
SHA-256: 56a53b80793a57ae0a2ff185a047ca1e37b57a0e8d64e13b04e3c35c58b8895d
font_02_sfnt_off00010d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9E 11684 bytes
SHA-256: f174a9313f51aeb4389d6bfd594d15e61d6b35139f439974bcd5c2273a4a22af
font_03_sfnt_off000133fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FB 16312 bytes
SHA-256: b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1

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