Malicious PDF — malware analysis report

Static analysis result for SHA-256 6657c4671c0555a3…

MALICIOUS

PDF

75.8 KB Created: 2021-03-11 15:05:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0f574d7879a171b58b45078253036009 SHA-1: c2461a2952d99e1bd6f787492393aadc00c71674 SHA-256: 6657c4671c0555a35cae240df0b49490d7fa25c8ae6dc5760e95796317f776ba
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically pointing to a URL that appears to be a lure for a worksheet answer key. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://gimoguvi.ru/wix?keyword=what+is+an+animal+worksheet+answers PDF link annotation
    • http://bitoxifa.sportsontheweb.net/2000_buick_century_repair_manual_free_download.pdfIn PDF document text
    • http://salukapebuke.iblogger.org/vietnam_real_estate_market_report.pdfIn PDF document text
    • http://nurigufasuvunu.iblogger.org/85528176147.pdfIn PDF document text
    • http://tomirak.iblogger.org/xunusilakuga.pdfIn PDF document text
    • http://zimidoj.iblogger.org/nefinenaduzisenozes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf662b27-e251-48c8-9908-f09589837b77/creswell_research_design_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40119548-a08f-4013-9f62-379713979e66/transition_words_for_4th_body_paragraph.pdfIn PDF document text
    • http://saboveliga.myartsonline.com/agile_framework.pdfIn PDF document text
    • http://pumuroxojab.rf.gd/pubudogoxifafavelatipedoj.pdfIn PDF document text
    • http://mopasaz.epizy.com/vivup.pdfIn PDF document text
    • http://miredibe.rf.gd/how_to_type_korean_on_keyboard.pdfIn PDF document text
    • http://zusapogadakafa.rf.gd/96901552075.pdfIn PDF document text
    • http://xibadon.rf.gd/pdf_file_to_word_converter_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d74ec60-936d-40c0-b56d-cfd089e11005/how_to_start_off_a_crochet_granny_square.pdfIn PDF document text
    • http://torumaxot.rf.gd/63152174057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e2e6449-ac0f-43bf-9429-52ea3eafd3f5/63159415937.pdfIn PDF document text
    • http://kotafonapajawut.epizy.com/the_hierophant_tarot_love_outcome.pdfIn PDF document text
    • http://fobegakolu.epizy.com/86631592844.pdfIn PDF document text
    • http://fetufebutegiv.rf.gd/sworn_affidavit_form_template.pdfIn PDF document text
    • http://sexuroduveso.rf.gd/rzr_1000_transmission_service.pdfIn PDF document text
    • http://levajutesa.rf.gd/assembler_compiler_interpreter.pdfIn PDF document text
    • http://bumufemukelogik.epizy.com/95107954983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0e2164f-e7e7-4827-a7b4-8d3f6ade02b7/35778538281.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_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 5096 bytes
SHA-256: b146bace9d132c3aa337a692e88ba651dd383d655817e73fd10d13dc223be973
font_01_sfnt_off0000ff4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 10104 bytes
SHA-256: f21e16ea23f1f190526a81d2628e140308046cf0b357dda8a2bc3d46fc8491d7

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