Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05b0b498a43fe5f…

MALICIOUS

PDF

64.3 KB Created: 2021-02-04 05:14:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3818a1e069b722b482fc8b55f1f1d7c3 SHA-1: f6ea585b80b2fbf1ddc9671051d6a91f4340a3f6 SHA-256: e05b0b498a43fe5f3731addec5dd5c222a4e43182a2b8db55abd95992e9f77f3
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'quotation marks for titles worksheets', which is likely a pretext to drive users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/aws?utm_term=quotation+marks+for+titles+worksheets PDF link annotation
    • http://uplrezina.site/libipapoxebo24ze4.pdfIn PDF document text
    • https://letogapebo.weebly.com/uploads/1/3/5/3/135320268/f580e6f981.pdfIn PDF document text
    • https://nirefuriwubava.weebly.com/uploads/1/3/1/6/131637308/dulewebizepagixezowo.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/heXgggc/dafariderov.pdfIn PDF document text
    • http://smartcoin.design/pancreas_histologyj9kbc.pdfIn PDF document text
    • https://magalezofutik.weebly.com/uploads/1/3/4/5/134599277/9995280.pdfIn PDF document text
    • https://forupiwiwipugo.weebly.com/uploads/1/3/5/3/135349306/113b5e602.pdfIn PDF document text
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/8596805660b3.pdfIn PDF document text
    • https://cdn.sqhk.co/siwebove/ijThbiP/zombie_monster_truck_cartoon.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisunez/ghpN7gj/lumurixonibora.pdfIn PDF document text
    • http://pr-bux.online/687110740637w75p.pdfIn PDF document text
    • http://nejepogiz.iblogger.org/ihss_provider_orientation_guide.pdfIn PDF document text
    • http://kivudutamazawan.22web.org/kikupujavuwuboxas.pdfIn PDF document text
    • https://cdn.sqhk.co/dikulodut/zhihdjj/tovumifunulozuwazeb.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/tokudapele/povibazavegin.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/afsana_pyar_ka_1991_songs.pdfIn PDF document text
    • http://nukasero.epizy.com/speaking_task_2_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/aranya_kandam_tamil_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/amazon_music_unlimited_expired.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_off0000bed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED7 5224 bytes
SHA-256: 992e08c6dc963bbd9cca02d61707832fba4e2a5fe3a501cf65ecab334d03e88a
font_01_sfnt_off0000d087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD087 10640 bytes
SHA-256: 4466faa7e77da08603ed2de1982df5d68ee419ca7d6a69ac1701c1b0d6ccc97a

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