Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a9d344b1edd50c…

MALICIOUS

PDF

80.7 KB Created: 2021-03-27 18:00:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1876ba615a644364825de4f56a257297 SHA-1: 6b40cbc65d90ff71325bc6479889c0003d800cfa SHA-256: 12a9d344b1edd50c4f562dc0537faaf15978a0d7598face0073ec7c6826ee8e6
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV also flagged this PDF as malicious, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The embedded URLs suggest an attempt to direct users to potentially malicious or phishing-related content, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://midufefew.ru/strik?utm_term=t+test+statistic+calculator+linear+regression PDF link annotation
    • http://dasiwujupuna.sportsontheweb.net/characteristics_of_african_culture.pdfIn PDF document text
    • http://devubowoku.mypressonline.com/patab.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/how_to_become_a_software_development_engineer.pdfIn PDF document text
    • http://nugowimabu.mywebcommunity.org/96702694321.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/50_shades_of_grey_2016.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/80140450822.pdfIn PDF document text
    • http://tapasin.sportsontheweb.net/41749267828.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6552665f-f3ce-4070-9f47-7b493df4570a.filesusr.com/ugd/3d88c7_75d2d1c5ad4749029441149f603a9f60.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fokapikow/dragon_ball_super_game_apkpure.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_68cfadc864154a209e0d096277f5d5e7.pdf?index=trueIn PDF document text
    • http://luxupovokajaf.onlinewebshop.net/63196172080.pdfIn PDF document text
    • http://bowegasobufur.myartsonline.com/siful.pdfIn PDF document text
    • https://2aa0b900-127f-4603-a19a-6a731d3c9eb1.filesusr.com/ugd/5eaffa_a5f253f72b7249c0a3ae140e5ee139e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/is_htc_one_m8_a_good_phone.pdfIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_7f50f08e3c33479ea8b8d02a3d8646d7.pdf?index=trueIn PDF document text
    • http://gitodake.myartsonline.com/functional_grammar_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/dedulerakomupiboxejib.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/gavusokadamegub.pdfIn PDF document text
    • http://naburonip.myartsonline.com/work_contract_agreement_sample.pdfIn PDF document text
    • http://sujunutab.atwebpages.com/ley_23554_defensa_nacional.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/95912133016.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/simple_web_page_template_in_html.pdfIn PDF document text
    • https://2ad55d82-15d9-4995-b72c-f03dca93b5f4.filesusr.com/ugd/11b7eb_5889c9645edc4593862cd789ea2aff00.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/year_2_maths_column_addition_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/android_aosp_build_log.pdfIn PDF document text
    • http://vupaguriwedizid.atwebpages.com/the_story_of_ruby_bridges_by_robert_coles.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA8 4916 bytes
SHA-256: 8744d24c39bded72b561fbd329ab58c4426127a09c6d06f6d719b2f7a5081ff8
font_01_sfnt_off00010e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 11300 bytes
SHA-256: d5a6a1749ac714287144a0a45ac2e9891e224ba2ffe3ea33bb1195649e91a961

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