Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71fa6a6c8dabbb1…

MALICIOUS

PDF

70.6 KB Created: 2021-03-17 17:01:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 835a20d1261d05f1d3efd5033f9275ef SHA-1: 97aece2068c92e19d8ab1927849ba14dca00e13f SHA-256: b71fa6a6c8dabbb1bb2cdf0265f3165e949618e99886ab532aedc17bbe61c162
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary focus on a URL that mimics a search result for educational material. This suggests a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=initial+consonant+worksheets+pdf
    • https://cdn.sqhk.co/sevimifogu/TBfahgP/sinhala_mashup_songs_2020_mp3_download.pdf
    • https://cdn.sqhk.co/xadakede/iigchau/in_modern_periodic_table_zig_zag_line_separate.pdf
    • https://cdn.sqhk.co/jisujesox/sSheig6/fm_radio_tuner_app_for_android_without_internet.pdf
    • http://keniworu.mywebcommunity.org/nutefelojodipuwokojuxux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_463cbf4c3bf44fa7955f7096c2ccad0f.pdf?index=true
    • https://s3.amazonaws.com/medaliwifufugel/behringer_reference_amplifier_model_a500.pdf
    • https://s3.amazonaws.com/zunewidimem/89089489226.pdf
    • https://s3.amazonaws.com/mizeteb/assam_tet_application_form_2019.pdf
    • http://zepizevut.atwebpages.com/the_republic_plato_free_download.pdf
    • https://s3.amazonaws.com/sebunuzu/zesejinusidesozuweramukeb.pdf
    • https://f3874c2d-c116-49c2-b7b6-9300dc8fc43e.filesusr.com/ugd/b11f6d_38f996f3cd784ebb95beef42510a427d.pdf?index=true
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_acf940d8497f4a97812a3e9f56c39eab.pdf?index=true
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_b4e6529a224d4e59bf475600c3fc5084.pdf?index=true
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_ec8dc95c107048ee94b6009a690a5f63.pdf?index=true
    • https://s3.amazonaws.com/magapeguwabe/zosetevarimolonu.pdf
    • https://s3.amazonaws.com/bejeseja/co_operative_inspector_exam_answer_key.pdf
    • https://s3.amazonaws.com/wibedubosateg/setagumuvobijeg.pdf
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_d83fe082b387490595c96bbdfc817b5c.pdf?index=true
    • https://s3.amazonaws.com/wozoxub/how_to_start_consumer_electronics_business.pdf
    • https://s3.amazonaws.com/wivunonovef/duke_require_sat_subject_tests.pdf
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_24bcb575938e48fea4203a520a2456ea.pdf?index=true
    • https://s3.amazonaws.com/falejogajir/vekagogivarakidij.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_off0000d5ff.bin
7865076388f7ebc968ddba91e7af97a131fde47303233816f4a5a97531b5ee5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FF 5336 bytes
font_01_sfnt_off0000e831.bin
b89ded42bc3368dbefb4c6a517ae870878b10fd2374cf7f803c11a0c860387e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 10280 bytes

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