Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc48c8b7c0f28b59…

MALICIOUS

PDF

77.7 KB Created: 2021-04-13 06:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2cb78dff3d4ec99421005808b6c54f24 SHA-1: 11c4ba43704ed8cdbaf270b570784cc7d0db9080 SHA-256: dc48c8b7c0f28b59ec70233b79de524526ac84b2c6c73db8f95bb256e3aa9e61
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=apple+financial+report+2017 PDF link annotation
    • http://serdyukov.pro/determiners_worksheets_for_class_7djruw.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/13372004386.pdfIn PDF document text
    • http://b2b-servis.ru/what_type_of_welding_is_easiest_to_learnozjww.pdfIn PDF document text
    • http://antonioit.fun/cpl_e_learning_answers_fireuvvbz.pdfIn PDF document text
    • https://totaguzoxexidi.weebly.com/uploads/1/3/2/7/132741029/galax.pdfIn PDF document text
    • https://misetibu.weebly.com/uploads/1/3/1/4/131438078/dalokuzub.pdfIn PDF document text
    • https://cdn.sqhk.co/samanugutu/hiViadb/business_card_layout_template_word.pdfIn PDF document text
    • http://cheeronthemove.store/alfred_piano_lesson_book_1babzs9.pdfIn PDF document text
    • https://gomosoganerat.weebly.com/uploads/1/3/4/4/134494513/vixarutakuwuw_lowezasa_pexuvabivuku.pdfIn PDF document text
    • https://pawizujepus.weebly.com/uploads/1/3/1/6/131637171/e8f17842aaa8.pdfIn PDF document text
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/3bb204cef.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/jIcgjlF/snapple_apple_facts.pdfIn PDF document text
    • http://13millions.store/vowonikowovunigaso53syw.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/16092ed.pdfIn PDF document text
    • https://galevegu.weebly.com/uploads/1/3/4/5/134507196/gosotavajujugofudi.pdfIn PDF document text
    • http://irisca.online/how_to_install_water_filter_in_keurig_k_duo_plusjbwqm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tevefetilojas.atwebpages.com/tu_cerebro_creativo_shelley_carson.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/bazajezilekug.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_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 5228 bytes
SHA-256: 3494a89606134f66a1468a809c3d4e61205d39da78ca2ca465bfe59d56910ce0
font_01_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 11660 bytes
SHA-256: c2b4a492d396c6167fb3958f1f8eefd6c6d3ddf16df22b4f78af8eefcba518e0

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